The traditional simple past tense of shrink is shrank: “The shirt shrank yesterday.” The past participle is shrunk, used with has, have, or had: “The shirt has shrunk.” In contemporary English, especially informal American English, shrunk also appears as a simple past form, but shrank remains the safest choice in formal writing.
Key Facts at a Glance
- Shrink is the base form: “Wool can shrink in hot water.”
- Shrank is the traditional simple past: “The wool sweater shrank.”
- Shrunk is the standard past participle: “The wool sweater has shrunk.”
- Shrunk also functions as a simple past form in some modern varieties of English, particularly conversational American English.
- Shrunken is generally an adjective before a noun: “a shrunken sweater.”
- Shrinked is not the normal modern past form and should be avoided in ordinary writing.
What Is the Past Tense of Shrink?
Shrank is the traditional past tense of shrink, while shrunk is traditionally the past participle. Use shrank when the verb stands alone in a completed past-time statement, and use shrunk after has, have, or had. Many speakers also use shrunk as a simple past form in casual speech.
The clearest formal distinction is:
- “The market shrank in 2024.”
- “The market has shrunk since 2024.”
- “The market had shrunk before the investment arrived.”
The first sentence uses the simple past. The second uses the present perfect. The third uses the past perfect. The tense depends on the auxiliary structure and the relationship between the event and the reference time.
Modern dictionaries record variation rather than treating every use of shrunk as identical. Merriam-Webster’s discussion of shrink, shrank, shrunk, shrinked describes the traditional pattern while acknowledging changing usage. Grammar commentators, including Grammarphobia, likewise note that shrunk is increasingly used as a standalone past form, especially in North American speech.
Complete Conjugation of Shrink
| Verb form | Grammatical name | Typical construction | Example |
|---|---|---|---|
| shrink | Base form | Present, infinitive, modal | “These fibers can shrink.” |
| shrinks | Third-person singular present | He, she, it + verb | “Cotton shrinks easily.” |
| shrank | Simple past | Standalone past verb | “The fabric shrank.” |
| shrunk | Past participle | Has, have, had + verb | “The fabric has shrunk.” |
| shrunken | Participial adjective | Before a noun | “A shrunken fabric sample” |
The verb can be transitive or intransitive. In “The shirt shrank,” the shirt became smaller. In “The dryer shrank the shirt,” the dryer caused the size reduction. The past forms remain the same in both constructions: “The dryer shrank the shirt” and “The dryer has shrunk the shirt.”
How Does Shrink Conjugate?
Shrink is an irregular strong verb whose vowel changes across forms: shrink, shrank, shrunk. English inherited this pattern from older Germanic verb systems, where internal vowel alternation carried grammatical information instead of an added -ed ending.
The pattern resembles several familiar verbs:
| Base form | Simple past | Past participle | Example |
|---|---|---|---|
| drink | drank | drunk | “She drank it; she has drunk it.” |
| sing | sang | sung | “He sang; he has sung.” |
| sink | sank | sunk | “The boat sank; it has sunk.” |
| shrink | shrank | shrunk | “The coat shrank; it has shrunk.” |
The comparison helps learners remember the traditional pattern, but English does not preserve every strong-verb distinction consistently. Drink and sing strongly resist using the participle as a normal simple past in standard edited prose, whereas shrunk has gained wider acceptance as a simple past variant.
Why Does the Vowel Change?
The vowel change marks different grammatical stages of the verb. Shrink identifies the base, shrank traditionally marks a completed event, and shrunk traditionally marks a completed event connected to another verb or used adjectivally.
The historical pattern has never been perfectly uniform. Older English varieties used more than one past-tense form, and later speakers regularized or redistributed forms in different ways. The modern distinction is therefore a useful standard convention, not a mathematically fixed rule shared identically by every dialect.
When Should You Use Shrank?
Use shrank for a completed past action when no perfect auxiliary precedes the verb. Shrank is the clearest choice in academic prose, business documents, journalism, examinations, and edited international English.
Examples include:
- “The patient’s tumor shrank after treatment.”
- “The company shrank its workforce during the downturn.”
- “The lake shrank during the dry season.”
- “The image shrank when I changed the display setting.”
- “Our budget shrank by 12 percent last year.”
A specific finished time strongly favors the simple past: yesterday, last summer, in 2022, or during the first quarter. The sentence “Sales shrank in 2022” presents the event as located in a completed period.
The transitive form also takes shrank:
“The heat shrank the plastic container.”
Here, shrank does not mean that the subject became smaller. The subject, heat, caused the object, container, to become smaller.
Is “The Ice Caps Shrunk” Wrong?
“The ice caps shrunk last summer” is widely understood and used, especially in informal American English, but “The ice caps shrank last summer” is the safer edited form. Traditional grammar distinguishes shrank as simple past from shrunk as past participle.
Use one of these standard alternatives:
- “The ice caps shrank last summer.”
- “The ice caps have shrunk over the past decade.”
- “The ice caps had shrunk before the satellite survey.”
The choice is not about whether the ice caps are plural. Verb form does not change according to singular or plural subject here. “The lake shrank” and “the lakes shrank” both use shrank in traditional simple past constructions.
When Should You Use Shrunk?
Use shrunk after has, have, or had when forming a perfect tense. The construction expresses a completed change that relates to a current, later, or previously established time.
Examples include:
- “The sweater has shrunk in the wash.”
- “The company has shrunk since its merger.”
- “Their savings have shrunk significantly.”
- “The population had shrunk before the census.”
- “The photograph has shrunk during compression.”
The auxiliary carries tense, while shrunk supplies the participle. In “has shrunk,” has marks present perfect. In “had shrunk,” had marks past perfect. The word shrunk itself does not need to change.
Passive constructions can also use shrunk when the verb is transitive:
“The fabric has been shrunk deliberately.”
That sentence contains has been, the perfect passive auxiliary sequence, followed by the participle shrunk. The phrase means that someone or something caused the fabric to become smaller.
Which Helping Verbs Work With Shrunk?
The most reliable test is to look for a perfect auxiliary such as has, have, or had, not merely for any helping verb. Forms such as will have shrunk, may have shrunk, and should have shrunk also take the past participle.
| Construction | Correct example | Function |
|---|---|---|
| has + shrunk | “The shirt has shrunk.” | Present perfect |
| have + shrunk | “The shirts have shrunk.” | Present perfect plural |
| had + shrunk | “The shirt had shrunk.” | Past perfect |
| will have + shrunk | “The shirt will have shrunk.” | Future perfect |
| may have + shrunk | “The shirt may have shrunk.” | Modal perfect |
| is + shrinking | “The shirt is shrinking.” | Present progressive |
A common oversimplification says that any helping verb requires shrunk. That is not accurate. “The shirt was shrinking” uses the present participle shrinking, and “the shirt did shrink” uses the base form shrink after did.
Can Shrunk Be the Simple Past?
Shrunk can be the simple past in contemporary English, but shrank remains the conservative and broadly accepted formal choice. American dictionaries and usage references recognize the variant, while many editors, teachers, and British style authorities still prefer the traditional distinction.
You may encounter:
- “The sweater shrunk in the wash.”
- “The company shrunk rapidly.”
- “The river shrunk during the drought.”
These examples are common in conversation and increasingly visible in edited North American writing. They are not incomprehensible or structurally random. Speakers have extended the participle into the simple past, a process that has affected other irregular verbs throughout the history of English.
For a formal essay, however, write:
- “The sweater shrank in the wash.”
- “The company shrank rapidly.”
- “The river shrank during the drought.”
The practical rule is register-based. Shrank minimizes editorial objections. Shrunk may accurately represent ordinary speech, dialogue, advertising, or a regional voice.
Does Region Affect the Choice?
Region affects how natural shrunk sounds as a simple past form. Traditional British and international edited English more consistently maintain shrank for the simple past, while American English permits shrunk more freely in informal and conversational contexts.
| Context | Preferred form | Example | Editorial risk |
|---|---|---|---|
| Academic essay | shrank | “The sample shrank.” | Low |
| Legal or regulatory document | shrank | “The fund shrank in value.” | Low |
| Formal American report | shrank | “Demand shrank by 8%.” | Low |
| Casual American speech | shrunk or shrank | “The shirt shrunk.” | Low in conversation |
| British formal writing | shrank | “The market shrank.” | Lowest |
| Character dialogue | Either, based on voice | “My jeans shrunk.” | Depends on realism |
The regional distinction is a tendency, not a universal boundary. Individual British speakers may use shrunk, and American editors may still change it to shrank. A publication’s house style matters more than a speaker’s passport.
What Did “Honey, I Shrunk the Kids” Change?
The 1989 film title Honey, I Shrunk the Kids helped make shrunk highly familiar as a standalone past form. The title uses a conversational construction, so it reflects popular speech rather than establishing the preferred form for formal grammar.
A title can intentionally preserve colloquial language, humor, or a character’s voice. It does not function as a style guide. In a formal sentence, “I shrank the kids” follows the traditional pattern, although the film’s title is fixed and should not be “corrected” when cited.
Is Shrunken a Verb or an Adjective?
Shrunken is primarily a participial adjective used before a noun, while shrunk is the normal past participle after an auxiliary. Write “a shrunken sweater,” but write “the sweater has shrunk.”
Compare the constructions:
| Form | Position | Correct example | Meaning |
|---|---|---|---|
| shrank | Simple past verb | “The sweater shrank.” | A completed past event |
| shrunk | Perfect-tense participle | “The sweater has shrunk.” | Completed change linked to a reference time |
| shrunk | Post-verb adjective in some contexts | “The sweater is shrunk.” | Describes a deliberately reduced state |
| shrunken | Attributive adjective | “A shrunken sweater” | Describes the resulting condition |
Shrunken often appears before nouns in phrases such as shrunken head, shrunken budget, shrunken pupil, and shrunken version. It can sound more literary, permanent, or descriptive than shrunk.
“The budget has shrunken” is normally wrong in standard English. Use “The budget has shrunk.” By contrast, “a shrunken budget” is acceptable because shrunken modifies budget.
Why Is Shrinked Usually Avoided?
Shrinked is not the normal modern past form of shrink, so ordinary speakers and editors generally replace it with shrank or shrunk. The usual choices are “the shirt shrank” for simple past and “the shirt has shrunk” for a perfect construction.
Incorrect in ordinary standard usage:
- “The image shrinked.”
- “The market has shrinked.”
- “She shrinked the document.”
Preferred versions:
- “The image shrank.”
- “The market has shrunk.”
- “She shrank the document.”
Some dictionaries record shrinked in specialized, rare, historical, or nonstandard uses. That documentation does not make it the appropriate default for a school assignment, professional report, or edited article. The form also creates an avoidable impression of treating an irregular verb as regular.
What Happens After Did?
After did, use the base form shrink, never shrank or shrunk. The auxiliary did already carries the past tense, so the main verb returns to its uninflected form.
Correct examples:
- “Did the sweater shrink?”
- “The sweater did not shrink.”
- “Why did the market shrink?”
- “The dryer did shrink the shirt.”
Incorrect examples:
- “Did the sweater shrank?”
- “The sweater did not shrunk.”
- “Why did the market shrank?”
This rule applies to other irregular verbs: “Did she drink?” not “Did she drank?” and “Did he sing?” not “Did he sang?”
What Is the Difference Between Shrank and Shrunk?
Shrank normally functions as the standalone simple past, whereas shrunk normally functions as the past participle after a perfect auxiliary. The forms can describe the same physical change, but their grammatical environments differ.
| Sentence | Form | Tense or function | Formal status |
|---|---|---|---|
| “The shirt shrank.” | shrank | Simple past | Standard |
| “The shirt has shrunk.” | shrunk | Present perfect | Standard |
| “The shirt had shrunk.” | shrunk | Past perfect | Standard |
| “A shrunken shirt lay nearby.” | shrunken | Adjective | Standard |
| “The shirt shrunk yesterday.” | shrunk | Simple past variant | Contemporary, register-sensitive |
The time expression can help. Yesterday usually accompanies shrank, while since yesterday usually accompanies has shrunk:
- “The fabric shrank yesterday.”
- “The fabric has shrunk since yesterday.”
The distinction is grammatical, not semantic. Both sentences describe a reduction in size, but the first presents a completed past event and the second connects the event to a present state or period continuing to the present.
Which Form Fits Formal Writing?
Choose shrank for a standalone past-tense verb and shrunk after has, have, or had. This choice works reliably in academic, corporate, legal, medical, and international writing because it follows the traditional distinction recognized by conservative copyeditors.
Use shrank in:
- Research papers: “The sample shrank after heating.”
- Financial reports: “Revenue shrank by 6% in the second quarter.”
- Medical summaries: “The lesion shrank after treatment.”
- Technical documentation: “The file size shrank after conversion.”
- News writing: “The population shrank between 2010 and 2020.”
Use shrunk in perfect constructions:
- “The sample has shrunk after repeated heating.”
- “Revenue has shrunk by 6% since January.”
- “The lesion had shrunk before the follow-up scan.”
- “The file has shrunk to 2 MB.”
Use the simple-past shrunk when reproducing a speaker’s natural voice, writing informal dialogue, or following a publication that explicitly accepts the variant. Consistency matters. A document that uses shrank in one paragraph and casual shrunk in another may appear uneven even if both forms are understandable.
What Common Mistakes Should You Fix?
The most frequent errors involve confusing tense with participle form, using shrank after did, and treating shrunken as a normal finite verb. Each error has a short structural correction.
- Using shrinked
- Incorrect: “The sweater shrinked.”
- Correct: “The sweater shrank.”
- Correct: “The sweater has shrunk.”
- Using shrunk after did
- Incorrect: “Did the sweater shrunk?”
- Correct: “Did the sweater shrink?”
- Using shrank after have
- Incorrect: “The sweater has shrank.”
- Correct: “The sweater has shrunk.”
- Using shrunken as the perfect participle
- Incorrect: “The sweater has shrunken.”
- Correct: “The sweater has shrunk.”
- Assuming plural subjects require a different form
- Incorrect reasoning: “The lakes are plural, so the verb must change.”
- Correct: “The lakes shrank during the drought.”
- Confusing shrinking with shrunk
- “The shirt is shrinking” describes an ongoing process.
- “The shirt has shrunk” describes a completed change.
- “The shirt shrank yesterday” describes a completed past event.
A Fast Editing Test
Replace the disputed verb with the forms of drink. If the sentence requires drank, choose shrank; if it requires drunk, choose shrunk.
- “The glass drank?” This test is unsuitable for meaning, but grammatically “Did he drink?” shows the base-form rule.
- “He drank the water” corresponds structurally to “The shirt shrank.”
- “He has drunk the water” corresponds structurally to “The shirt has shrunk.”
The rhyme shrink, shrank, shrunk is useful for memorization, but context still controls the form. Memory aids cannot replace checking for has, have, had, or did.
What Should You Write in Different Situations?
The best form depends on the sentence structure and the audience. Shrank is the default for formal standalone past tense; shrunk is required in traditional perfect constructions and acceptable as a simple past variant in some dialects.
| Intended meaning | Recommended sentence | Reason |
|---|---|---|
| Completed event yesterday | “The sweater shrank yesterday.” | Simple past |
| Change continuing to now | “The sweater has shrunk.” | Present perfect |
| Change completed before another past event | “The sweater had shrunk before washing.” | Past perfect |
| Ongoing reduction | “The sweater is shrinking.” | Progressive aspect |
| Resulting condition before a noun | “A shrunken sweater” | Adjectival use |
| Informal American dialogue | “My sweater shrunk.” | Accepted conversational variant |
| Formal international prose | “My sweater shrank.” | Conservative standard |
One expert editorial rule is especially practical: when a sentence contains a finished calendar time, prefer shrank; when it contains since, already, yet, or a connection to the present, inspect whether has shrunk is required.
Another rule concerns passive voice. “The shirt was shrunk” can be correct when was forms a passive construction, as in “The shirt was shrunk intentionally.” The presence of was does not automatically determine the form. The grammatical sequence is was + past participle, and shrunk supplies that participle.
FAQ
Is “The company has shrank” correct?
No, not in standard edited English. Write “The company has shrunk.” The auxiliary has requires the past participle, and shrunk is the traditional past participle of shrink. Write “The company shrank last year” when using a standalone simple past construction.
Is “I shrunk my clothes” grammatically acceptable?
Yes, I shrunk my clothes is accepted as a simple past variant in contemporary English, particularly in informal American usage. For formal writing, use I shrank my clothes. If the sentence uses a perfect auxiliary, write I have shrunk my clothes.
What is the past tense of shrink in British English?
The traditional British English form is shrank for the simple past and shrunk for the past participle. British speakers do use shrunk as a simple past variant, but shrank is the safer choice in formal British writing, examinations, and edited publications.
Can “shrunk” describe a noun?
Yes. Shrunk can occur in phrases such as “pre-shrunk cotton” and in some predicate descriptions, although shrunken is common before a noun. Write “The cotton has shrunk” for a verb and “a shrunken cotton shirt” for an adjective.
Why does the film title use “Honey, I Shrunk the Kids”?
The title uses shrunk as a conversational simple past form. It is a fixed movie title and should remain unchanged. The title reflects popular usage and comic dialogue, not a requirement that formal writers replace shrank with shrunk.
Is “shrink” ever correct for a past event?
Yes, after did, could, would, might, or another modal auxiliary. Write “Did the fabric shrink?” and “The fabric might shrink.” Modal and do-support constructions take the base form, not shrank or shrunk.
The Bottom Line
For the query “shrank or shrunk, what’s the past tense of shrink?”, the safest answer is: shrank is the traditional simple past, and shrunk is the traditional past participle. Write “The shirt shrank yesterday” and “The shirt has shrunk.” Contemporary speakers may use shrunk as the simple past, especially in casual American English, but formal writers should preserve the shrank / shrunk distinction.
