Table of Contents
Quick Overview
Understanding the difference between Sank and Sunk is essential for clear, professional writing in American English. These two words are classic homophones-they sound almost identical in everyday speech, but they have completely different meanings and grammatical functions. Mixing them up is one of the most common spelling and grammar mistakes in the English language.
| Feature | Sank | Sunk |
|---|---|---|
| Meaning | Describes an action of going down that happened and ended in the past | Describes a completed action (with have/had) or a state of being underwater |
| Part of Speech | Verb (Simple Past Tense) | Verb (Past Participle) or Adjective |
| Pronunciation | /sæŋk/ (Rhymes with bank) | /sʌŋk/ (Rhymes with dunk) |
| Common Contexts | Storytelling, historical events, physical descent | Perfect tenses, descriptions of submerged objects, sunk costs |
| Example | The ship sank in 1912. | The ship has sunk. |
| Memory Trick | Sank = Drank (Simple past) | Sunk = Drunk (Past participle, needs 'have') |
Understanding "Sank"
A detailed breakdown of meaning, grammar, and usage.
Meaning
Pronunciation
Word Class (Verb)
Grammar
Common Uses
Literal Meaning
Figurative Meaning
American English Usage
Typical Sentence Patterns
Common Collocations
Understanding "Sunk"
A detailed breakdown of meaning, grammar, and usage.
Meaning
Pronunciation
Word Class (Verb / Adjective)
Grammar
Common Uses
Literal Meaning
Figurative Meaning
American English Usage
Typical Sentence Patterns
Common Collocations
Key Differences
Core Definition
Sank is the simple past tense, describing a completed action. Sunk is the past participle, used with helping verbs or as an adjective.
Grammar Rule
Sank stands alone without auxiliary verbs (The rock sank). Sunk requires have/has/had (The rock has sunk) or modifies a noun.
Pronunciation
Sank is pronounced /sæŋk/ (short 'a' like in bank). Sunk is pronounced /sʌŋk/ (short 'u' like in dunk).
Part of Speech
Sank is strictly a verb. Sunk can be a verb (participle) or an adjective.
Comparison Table
| Feature | Sank | Sunk |
|---|---|---|
| Meaning | Describes an action of going down that happened and ended in the past | Describes a completed action (with have/had) or a state of being underwater |
| Part of Speech | Verb (Simple Past Tense) | Verb (Past Participle) or Adjective |
| Pronunciation | /sæŋk/ (Rhymes with bank) | /sʌŋk/ (Rhymes with dunk) |
| Common Contexts | Storytelling, historical events, physical descent | Perfect tenses, descriptions of submerged objects, sunk costs |
| Example | The ship sank in 1912. | The ship has sunk. |
| Memory Trick | Sank = Drank (Simple past) | Sunk = Drunk (Past participle, needs 'have') |
Grammar Rules
Grammar Rules & Mechanics
The distinction between 'sank' and 'sunk' follows the same pattern as 'drank' vs 'drunk' or 'rang' vs 'rung'. Mastering this irregular verb conjugation is essential for correct English.
Simple Past vs. Past Participle
'Sank' is the simple past, used for past actions. 'Sunk' is the past participle, used in perfect tenses with 'have/has/had'.
- Correct: The boat sank yesterday.
- Incorrect: The boat sunk yesterday.
- Correct: The boat has sunk.
- Incorrect: The boat has sank.
Use 'sank' (simple past) because no helping verb is present.
Use 'sunk' (past participle) because it follows the helping verb 'has'.
The Helping Verb Test
If you can place the word 'have', 'has', or 'had' in front of the verb and it sounds correct, you should use 'sunk'. If it sounds wrong, use 'sank'.
- Correct: The company had sunk millions into the project.
- Incorrect: The company had sank millions into the project.
Because 'had' is present, the past participle 'sunk' is required.
Adjective Usage
Only 'sunk' (or 'sunken') can act as an adjective. 'Sank' cannot.
- Correct: We must recover the sunk funds.
- Incorrect: We must recover the sank funds.
Use 'sunk' as an adjective to describe the lost funds.
Passive Voice
In passive constructions (using 'was' or 'were'), 'sunk' is the correct form because it functions as a past participle.
- Correct: The battleship was sunk by a torpedo.
- Incorrect: The battleship was sank by a torpedo.
Use 'sunk' after 'was' or 'were' in passive voice sentences.
When to Use "Sank"
Specific scenarios where 'sank' is the correct choice. It is the simple past tense of 'sink' and is used to describe a completed action without any helping verbs.
Narrating Past Events
Use 'sank' when telling a story about something that went down in the past.
Example: The heavy iron anchor sank to the bottom of the sea.
Describing Physical Descent
Use 'sank' to describe a person or object physically lowering or falling.
Example: Exhausted, he sank onto the couch.
Historical Disasters
Use 'sank' when referring to historical ships or vessels that went underwater.
Example: The Titanic sank on its maiden voyage.
Declining Values
Use 'sank' to describe a drop in prices, temperatures, or statistics in the past.
Example: The stock market sank 500 points yesterday.
Emotional Reactions
Use 'sank' in the idiom 'heart sank' to describe a sudden feeling of disappointment.
Example: My heart sank when I saw the failing grade.
Sports and Games
Use 'sank' to describe successfully making a shot in basketball or golf.
Example: He sank the winning putt on the 18th hole.
Losing Support
Use 'sank' to describe a loss of popularity or influence.
Example: The politician's approval rating sank after the scandal.
Digging or Excavating
Use 'sank' to describe the act of driving something into the ground.
Example: The workers sank the fence posts deep into the soil.
When to Use "Sunk"
Specific scenarios where 'sunk' is the correct choice. It is the past participle, requiring a helping verb (have/has/had), or it acts as an adjective describing a submerged state.
Present Perfect Tense
Use 'sunk' with 'has' or 'have' to describe a past action affecting the present.
Example: The enemy fleet has sunk three of our ships.
Past Perfect Tense
Use 'sunk' with 'had' to describe an action completed before another past action.
Example: By the time we arrived, the boat had already sunk.
As an Adjective
Use 'sunk' to describe something that is currently submerged or in a lowered state.
Example: The divers explored the sunk treasure galleon.
Sunk Costs (Business)
Use 'sunk' in economics to describe money that has already been spent and cannot be recovered.
Example: We must ignore the sunk costs when deciding the project's future.
Physical Appearance
Use 'sunk' to describe hollow or deeply recessed facial features.
Example: His cheeks were sallow and sunk from illness.
Passive Voice
Use 'sunk' in passive constructions to describe something that was forced underwater.
Example: The submarine was sunk by a depth charge.
Investment Losses
Use 'sunk' to describe money lost in a venture.
Example: He has sunk millions into the failing startup.
Sunk Fences (Architecture)
Use 'sunk' to describe a structural feature built below ground level, like a ha-ha wall.
Example: The estate used a sunk fence to keep sheep out of the garden.
Common Expressions
Idioms and standard phrases that rely on the specific meaning of each word.
Expressions with "Sank"
1. Sank to the bottom
Meaning: Describing a heavy object dropping below a liquid surface in the past.
Example: The gold coin sank to the bottom of the fountain.
2. Heart sank
Meaning: An idiom describing a sudden feeling of dread or disappointment.
Example: Her heart sank when she received the rejection letter.
3. Sank quickly
Meaning: Describing a rapid descent underwater.
Example: The damaged vessel sank quickly after the collision.
4. Sank into the chair
Meaning: Describing the physical act of resting heavily into soft furniture.
Example: Tired after work, he sank into the armchair.
5. Sank without a trace
Meaning: Disappearing completely and suddenly.
Example: The explorer's ship sank without a trace in the Bermuda Triangle.
6. Sank a basket
Meaning: Successfully throwing a ball through a hoop in basketball.
Example: He sank a three-pointer from half-court.
7. Sank like a stone
Meaning: Descending extremely fast and heavily.
Example: The heavy metal debris sank like a stone.
8. Sank to his knees
Meaning: Falling to a kneeling position, often out of exhaustion or emotion.
Example: The runner sank to his knees after crossing the finish line.
9. Stocks sank
Meaning: A sharp decline in financial market value.
Example: Tech stocks sank after the poor earnings report.
10. Sank into despair
Meaning: Falling into a deep state of hopelessness.
Example: After losing his family, he sank into despair.
11. Sank a well
Meaning: The historical act of digging or drilling a water well.
Example: The pioneers sank a well to access fresh water.
12. Sank a putt
Meaning: Hitting a golf ball into the hole.
Example: Tiger Woods sank a long putt on the 18th green.
13. Sank below the horizon
Meaning: The visual act of the sun or moon going out of sight.
Example: The sun sank below the horizon, ending the day.
14. Sank the battleship
Meaning: The military action of destroying an enemy vessel.
Example: The submarine sank the enemy battleship.
15. Sank into debt
Meaning: Falling increasingly into financial trouble.
Example: The company sank into debt after a series of bad investments.
16. Sank in the mud
Meaning: Becoming stuck or trapped in soft, wet earth.
Example: The tractor's tires sank in the mud.
17. Sank into a coma
Meaning: Losing consciousness and entering a deep unresponsive state.
Example: After the accident, the patient sank into a coma.
18. Sank in the rankings
Meaning: Dropping to a lower position in a competitive list.
Example: The tennis player sank in the rankings after an injury.
19. Sank a pint
Meaning: Informal British/American phrase for quickly drinking a glass of beer.
Example: He went to the pub and sank a pint of ale.
20. Sank under the waves
Meaning: A poetic description of a ship going completely underwater.
Example: The galleon sank under the waves during the hurricane.
Expressions with "Sunk"
1. Sunk cost
Meaning: Money that has already been spent and cannot be recovered.
Example: We shouldn't continue the project just because of the sunk costs.
2. Has sunk
Meaning: Present perfect tense indicating a vessel or object is now underwater.
Example: The ferry has sunk, but all passengers were rescued.
3. Had sunk
Meaning: Past perfect tense describing an action completed before another past event.
Example: By 1945, several enemy ships had sunk in the harbor.
4. Sunk without a trace
Meaning: Describing something that has completely disappeared.
Example: The funds have sunk without a trace in the offshore account.
5. Sunk cheeks
Meaning: Physical facial features that are hollowed out, usually due to illness or age.
Example: The patient's sunk cheeks indicated severe malnutrition.
6. Sunk eyes
Meaning: Eyes that appear deep-set in the sockets due to exhaustion or poor health.
Example: He stared at me with dark, sunk eyes.
7. Was sunk
Meaning: Passive voice describing a vessel that was destroyed underwater.
Example: The legendary battleship was sunk by a mine.
8. Sunk money into
Meaning: Investing or wasting funds into a venture.
Example: She has sunk thousands of dollars into her education.
9. Sunk to a new low
Meaning: Reaching a previously uncharted level of poor behavior or bad quality.
Example: The political debate has sunk to a new low.
10. Sunk treasure
Meaning: Valuable goods currently resting at the bottom of the sea.
Example: The explorers are searching for the sunk treasure of the Spanish fleet.
11. Sunk fence
Meaning: A type of boundary ditch or wall built below ground level.
Example: The English garden featured a sunk fence to keep deer out.
12. Sunk to the bottom
Meaning: Describing the current resting place of a heavy object in liquid.
Example: The anchor has sunk to the bottom of the lake.
13. Sunk in thought
Meaning: Being deeply engrossed in one's own mind.
Example: He sat there, sunk in thought, ignoring the party around him.
14. Sunk in despair
Meaning: A state of being entirely consumed by hopelessness.
Example: After the bankruptcy, he was sunk in despair.
15. Sunk an investment
Meaning: Having committed funds to a project.
Example: The firm has sunk a massive investment into the new AI technology.
16. Has sunk in
Meaning: When a piece of information has finally been understood or accepted.
Example: The reality of his victory has finally sunk in.
17. Sunk battleship
Meaning: A naval vessel currently resting underwater.
Example: They scuba dive near the sunk battleship.
18. Sunk like a stone
Meaning: Having descended very quickly and heavily.
Example: The heavy safe has sunk like a stone into the mud.
19. Sunk to zero
Meaning: A metric or value that has dropped to absolutely nothing.
Example: The battery life has sunk to zero.
20. Sunk in the mud
Meaning: Currently trapped or buried deep in wet earth.
Example: The ancient cart was found sunk in the mud.
Collocations
Sank to the bottom
Meaning: Descended to the lowest point of a body of water.
Example: The ring sank to the bottom of the swimming pool.
Heart sank
Meaning: Experienced a sudden feeling of disappointment.
Example: My heart sank when I saw the damage to my car.
Sank quickly
Meaning: Went down fast.
Example: The lightweight raft sank quickly under the weight.
Sank without a trace
Meaning: Disappeared entirely without leaving evidence.
Example: The plane sank without a trace over the ocean.
Sank like a stone
Meaning: Dropped heavily and immediately.
Example: The cannonball sank like a stone.
Sank into despair
Meaning: Fell into deep hopelessness.
Example: The nation sank into despair after the king's death.
Sank to his knees
Meaning: Collapsed into a kneeling position.
Example: He sank to his knees in prayer.
Sank a basket
Meaning: Scored points in basketball.
Example: She sank a basket just before the buzzer.
Sank a putt
Meaning: Hit a golf ball into the hole.
Example: He calmly sank a putt to win the tournament.
Sank below the horizon
Meaning: The sun or moon went out of view.
Example: The moon sank below the horizon at dawn.
Sunk cost
Meaning: Money already spent that cannot be recovered.
Example: Let's not worry about the sunk cost; let's focus on future profits.
Has sunk
Meaning: Present perfect form indicating a completed descent.
Example: The inflatable boat has sprung a leak and has sunk.
Sunk cheeks
Meaning: Hollowed facial features from illness.
Example: The fever left him with pale, sunk cheeks.
Sunk eyes
Meaning: Deep-set, tired eyes.
Example: Her sunk eyes showed she hadn't slept in days.
Sunk to a new low
Meaning: Reached a worse standard than ever before.
Example: The press has sunk to a new low with that headline.
Was sunk
Meaning: Passive voice for a destroyed vessel.
Example: The pirate ship was sunk by the navy.
Sunk money into
Meaning: Invested funds into something.
Example: He has sunk his life savings into the restaurant.
Sunk in thought
Meaning: Deeply engrossed in thinking.
Example: The professor sat at his desk, sunk in thought.
Sunk treasure
Meaning: Lost valuables currently underwater.
Example: They are hunting for sunk treasure near the reef.
Sunk in the mud
Meaning: Currently trapped in wet dirt.
Example: The lost boots were sunk in the mud for years.
Idioms
Heart sank
Meaning: To suddenly feel disappointment or dread.
Example: My heart sank when I realized I lost my passport.
Sank like a stone
Meaning: To fall or drop extremely fast and heavily.
Example: The lead weight sank like a stone to the bottom.
Sank without a trace
Meaning: To disappear completely without leaving any sign.
Example: The old fishing boat sank without a trace off the coast.
Sank to a new low
Meaning: To behave worse or reach a lower standard than before.
Example: The comedy show sank to a new low with that offensive joke.
Sank into oblivion
Meaning: To be completely forgotten by everyone.
Example: The once-famous actor sank into oblivion after his last movie.
Sank their differences
Meaning: Agreed to stop arguing and work together.
Example: The two rival families sank their differences at the wedding.
Sank a battleship
Meaning: Literal or metaphorical destruction of a large entity.
Example: The investigative journalist sank the corporation's battleship.
Sank into a coma
Meaning: To fall into a state of deep unconsciousness.
Example: After the stroke, the patient sank into a coma.
Sank into the background
Meaning: To become less noticeable or important.
Example: As the meeting went on, her ideas sank into the background.
Sank in the estimation of
Meaning: To lose respect in someone's eyes.
Example: The manager sank in the estimation of his team after the outburst.
Sunk cost fallacy
Meaning: The logical fallacy of continuing a bad project just because money has already been spent.
Example: Staying in a bad movie just because you paid for the ticket is the sunk cost fallacy.
Sunk without a trace
Meaning: Having disappeared completely without any evidence left behind.
Example: All the company's profits have sunk without a trace.
Sunk in thought
Meaning: Deeply absorbed in one's own thinking.
Example: He sat in the armchair, sunk in thought about his future.
Sunk in despair
Meaning: In a state of complete hopelessness.
Example: After the foreclosure, the family was sunk in despair.
Sunk to a whisper
Meaning: Having lowered one's voice to a very quiet level.
Example: Her voice has sunk to a whisper so no one else could hear.
Sunk in poverty
Meaning: Being trapped in a state of extreme destitution.
Example: The refugees were sunk in poverty and desperation.
Sunk in gloom
Meaning: Surrounded by an atmosphere of deep sadness.
Example: The office was sunk in gloom after the layoffs were announced.
Has sunk in
Meaning: When information or a realization has finally been fully understood.
Example: It took a while, but the reality of his promotion has finally sunk in.
Sunk to his knees
Meaning: Having collapsed or fallen into a kneeling position out of weakness.
Example: After walking for days, the hiker had sunk to his knees in the dirt.
Sunk in vice
Meaning: Deeply involved in immoral or wicked behavior.
Example: The aristocrat was sunk in vice and corruption.
Example Sentences
Easy
- The small boat sank in the storm.
- The rock sank to the bottom of the pool.
- The boy has sunk his toy in the bathtub.
- My heart sank when I lost my keys.
- The sun sank below the hills.
- Has the ship sunk yet?
- He sank into the soft bed.
- The cookie sank into my glass of milk.
- The lost city has sunk beneath the ocean.
- She sank the basketball into the hoop.
- The fisherman's line sank into the water.
- All my money has sunk into this project.
- The heavy anchor sank quickly.
- The old car was sunk in the mud.
- The temperature sank to freezing last night.
- The balloon sank slowly to the ground.
- He had sunk to his knees to pray.
- The coin sank out of sight.
- The rumor has sunk his reputation.
- She sank down into the chair.
Intermediate
- The Titanic sank in 1912 during its maiden voyage.
- By the time the rescue team arrived, the canoe had already sunk.
- The company's stock sank dramatically after the CEO resigned.
- He has sunk thousands of dollars into restoring the classic car.
- Exhausted from the hike, she sank onto the park bench.
- The pirate ship was sunk by a cannonball off the coast of Florida.
- Her heart sank when she saw the terrible traffic on the highway.
- The student's grades sank because he spent too much time playing video games.
- The accountant explained the concept of sunk costs to the managers.
- The basketball player sank a three-pointer from half-court at the buzzer.
- The reality of the tragic accident has finally sunk in.
- The heavy machinery sank deep into the soft mud of the construction site.
- The sailor's body was found with pale skin and sunk eyes.
- The political candidate's approval rating sank to an all-time low.
- They realized the funds had sunk into a fraudulent offshore account.
- The weary traveler sank into a deep sleep at the hotel.
- The divers explored the ship that had sunk during World War II.
- The priest sank to his knees and began to pray for guidance.
- The company has sunk to a new low by exploiting its workers.
- The golfer calmly sank a ten-foot putt to win the championship.
Advanced
- The beleaguered maritime vessel sank rapidly after striking an uncharted reef.
- By the time the naval inquiry convened, the submarine had sunk to a depth of 400 fathoms.
- The corporation's market capitalization sank precipitously following the antitrust ruling.
- The philanthropist has sunk a substantial fortune into eradicating infectious diseases.
- As the harrowing tale unfolded, the audience's collective spirit sank.
- The venerable galleon was sunk by a rogue privateer in the Caribbean.
- The architect's reputation sank when the structural flaws in the bridge were exposed.
- Economists warn against the sunk cost fallacy when evaluating failing enterprises.
- The seasoned athlete sank the decisive free throw amidst a cacophony of boos.
- The grim reality of the pandemic has finally sunk in for the global populace.
- The armored tank sank precipitously into the quagmire of the battlefield.
- The famine left the region's children with emaciated limbs and sunk cheeks.
- The incumbent's political capital sank irrevocably after the corruption scandal.
- The venture capitalist realized his investments had sunk into a Ponzi scheme.
- The despondent protagonist sank into an abyss of existential nihilism.
- The maritime archaeologists meticulously excavated the vessel that had sunk millennia ago.
- The penitent monk sank to his knees, beseeching the divine for clemency.
- The journalistic integrity of the tabloid has sunk to an unprecedented nadir.
- The grandmaster sunk the opposing king with a brilliant, calculated maneuver.
- The orator's profound words sank into the minds of the enraptured listeners.
Academic
- The research vessel sank in the Weddell Sea after succumbing to crushing ice pressure.
- The data indicates that the localized aquifer had sunk significantly due to over-extraction.
- The university's endowment sank marginally during the fiscal quarter's market volatility.
- The principal investigator has sunk years into compiling the longitudinal study.
- Morale in the academic department sank following the denial of tenure for a favored professor.
- It was noted in the historical record that the flotilla was sunk by a sudden squall.
- The credibility of the pseudoscientific theory sank under rigorous peer review.
- Behavioral economists emphasize that sunk costs should not influence rational decision-making.
- The experimental subject's baseline heart rate sank during the meditation phase.
- The paradigm-shifting hypothesis has finally sunk in among the scientific community.
- The heavy sediment sank to the benthic zone, creating a stratified layer.
- The clinical description notes the patient presented with sallow skin and sunk eyes.
- The civilization's cultural output sank into a period of stagnation.
- The foundation's grants have sunk into researching renewable energy matrices.
- The philosopher's psyche sank into profound ontological uncertainty.
- The oceanographic survey mapped the galleon that had sunk in the 16th century.
- The geologic plate sank beneath the continental crust, triggering a subduction zone.
- The ethical standards of the experiment have sunk to an unacceptable level.
- The mathematician sunk the variable into a complex differential equation.
- The implications of the theorem slowly sank in over the course of the lecture.
Business
- The startup's valuation sank after the initial product launch failed.
- The corporation has sunk considerable capital into expanding its Asian operations.
- Investor confidence sank when the CEO announced his sudden departure.
- We must evaluate the project's future viability, ignoring any sunk costs.
- The retail chain's profits sank during the economic recession.
- The competitor was sunk by a series of devastating lawsuits.
- The manager's authority sank when the team discovered his lack of technical knowledge.
- The conglomerate has sunk millions into research and development.
- Sales figures sank unexpectedly in the third quarter.
- The realization that the market was saturated finally sunk in for the executives.
- The logistics company's fleet sank into disrepair due to poor maintenance.
- The CEO presented with pale skin and sunk eyes after days of negotiation.
- The company's market share sank to an all-time low this quarter.
- The venture capitalist has sunk his personal wealth into the biotech firm.
- The manager sank into his chair, overwhelmed by the budget report.
- The rival tech company was sunk by a massive data breach.
- The brand's reputation has sunk to an unacceptable level.
- The marketing team sank the new product line with a terrible campaign.
- The firm's resources have sunk into a completely unprofitable sector.
- The board's decision to fire the founder finally sank in among the employees.
Real-Life Conversations
Office
Colleague 1: Did you see what happened to the stock market yesterday?
Colleague 2: Yes, our shares sank by 10% in just a few hours.
Colleague 1: My heart sank when I opened my brokerage app.
Colleague 2: Don't worry. We have sunk money into solid companies; they will recover.
Retail
Customer: I dropped my phone in the bathtub.
Cashier: Did it sink to the bottom?
Customer: Yes, it sank immediately and now it won't turn on.
Cashier: Unfortunately, water damage means your warranty has sunk as well.
School
Student: I studied all night for the history test.
Teacher: Your effort was good, but your grade sank because of the essay section.
Student: The reality of my failing grade has finally sunk in.
Teacher: Just remember, one bad test isn't a sunk cost. You can still pass the class.
Travel
Passenger: Is it true that there are shipwrecks near this island?
Agent: Yes, a famous pirate ship sank right off that coast in 1700.
Passenger: Wow. So it has been sunk down there for over three centuries!
Formal vs Informal Usage
Professional Emails
In professional writing, 'sank' describes past declines, while 'sunk' is used in perfect tenses or to describe unrecoverable investments.
Example: Our profit margins sank last quarter, but we have not yet sunk additional funds into the failing division.
Legal Writing
Legal documents use 'sank' for past actions of destruction, and 'sunk' for the state of assets or passive destruction.
Example: The defendant's credibility sank during cross-examination; furthermore, the plaintiff's capital was sunk into a fraudulent scheme.
Business English
Financial Analysis
In finance, 'sank' describes a historical drop in value, while 'sunk' describes unrecoverable past expenses.
Example: The stock price sank to $10, representing a massive sunk cost for early investors.
Project Management
Managers use 'sank' to describe time already spent, and 'sunk' to describe resources permanently lost.
Example: We sank two weeks into planning, but we must abandon it due to the sunk costs.
Academic Writing
Historical Papers
Historical writing uses 'sank' for simple past events and 'sunk' for vessels currently resting underwater.
Example: The Lusitania sank in 1915; it has sunk to the bottom of the ocean ever since.
Economic Studies
Economists strictly use 'sunk' as an adjective to describe costs that should be ignored in future marginal analysis.
Example: The firm's stock sank because managers failed to ignore sunk costs in their expansion strategy.
Common Mistakes
The boat sunk yesterday.
Correct: The boat sank yesterday.
Why: 'Sank' is the simple past tense and does not use a helping verb. 'Sunk' requires 'has' or 'had'.
She has sank the ball into the hoop.
Correct: She has sunk the ball into the hoop.
Why: Use the past participle 'sunk' after the helping verb 'has'.
The company had sank millions into the project.
Correct: The company had sunk millions into the project.
Why: After 'had', you must use the past participle 'sunk'.
We must ignore the sank costs.
Correct: We must ignore the sunk costs.
Why: 'Sunk' is the adjective form used to describe unrecoverable costs.
My heart sunk when I heard the news.
Correct: My heart sank when I heard the news.
Why: The idiom uses the simple past tense: 'my heart sank'.
The treasure was sank by the pirates.
Correct: The treasure was sunk by the pirates.
Why: In passive voice, use the past participle 'sunk' after 'was'.
The ship has sank without a trace.
Correct: The ship has sunk without a trace.
Why: The helping verb 'has' requires the past participle 'sunk'.
He sank into the chair, exhausted.
Correct: He sank into the chair, exhausted.
Why: This sentence is actually correct. 'Sank' is the proper simple past tense.
The diver found the sank ship.
Correct: The diver found the sunk ship.
Why: When modifying a noun as an adjective, use 'sunk'.
The stock market had sank 300 points.
Correct: The stock market had sunk 300 points.
Why: Use 'sunk' after the helping verb 'had'.
Learning Tips
Memory Trick: Drank/Drunk
Relate it to 'drink'. You say 'I drank' (simple past) and 'I have drunk' (past participle). Similarly, you say 'it sank' and 'it has sunk'.
The Helping Verb Rule
If there is a 'have', 'has', or 'had' in the sentence, always use 'sunk'. If there isn't, use 'sank'.
Pronunciation Focus
Sank uses a short 'a' sound (/sæŋk/), like 'bank'. Sunk uses a short 'u' sound (/sʌŋk/), like 'dunk'.
The Adjective Check
If the word is describing a noun (like 'sunk costs' or 'sunk eyes'), it is always 'sunk'. 'Sank' cannot be an adjective.
The Passive Voice Rule
If the sentence uses 'was' or 'were' (passive voice), always follow it with 'sunk', never 'sank'.
🎮 Mini Quiz
Test your knowledge with these interactive questions.
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Frequently Asked Questions
Quick answers to common questions.
What is the main difference between sank and sunk?
'Sank' is the simple past tense, used for a completed action (The ship sank). 'Sunk' is the past participle, used with helping verbs (The ship has sunk) or as an adjective.
Is it 'the boat sank' or 'the boat sunk'?
It is 'the boat sank'. 'Sank' is the correct simple past tense when no helping verb is used.
Can 'sunk' be used without 'have' or 'has'?
Only as an adjective (e.g., 'sunk costs', 'sunk eyes'). As a verb, it always requires a helping verb like 'have', 'has', 'had', 'was', or 'were'.
What is the past tense of sink?
The simple past tense of sink is 'sank'.
What is the past participle of sink?
The past participle of sink is 'sunk'.
Why do people say 'the boat sunk'?
It is a common grammatical error where people use the past participle 'sunk' instead of the simple past 'sank'. This happens frequently in informal speech.
What is a 'sunk cost'?
A 'sunk cost' is an economic term for money that has already been spent and cannot be recovered. Rational decision-making dictates ignoring sunk costs.
Is it 'my heart sank' or 'my heart sunk'?
It is 'my heart sank'. This idiom uses the simple past tense to describe the sudden feeling of disappointment.
How do you pronounce sank and sunk?
'Sank' is pronounced /sæŋk/ (rhyming with bank). 'Sunk' is pronounced /sʌŋk/ (rhyming with dunk).
Is it 'has sunk in' or 'has sank in'?
It is 'has sunk in'. This phrase means a fact has been fully understood, and it uses the present perfect tense, requiring the past participle 'sunk'.
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