How to Use Mistook or Mistaken (Irregular Verbs)

Updated August 6, 2025
Originally published July 28, 2023
5 min read
By Yash, D

Both mistook and mistaken are past forms of the present tense verb, mistake. Mistook is the simple past tense, whereas mistaken is the past participle form.

How to Use Mistook or Mistaken (Irregular Verbs)

What's the past tense of "mistake"?

The simple past tense of mistake is mistook, and the past participle is mistaken. Use mistook for simple past and mistaken as the past participle with auxiliary verbs.

Definition of mistake

The Cambridge Dictionary defines mistake as "an action, decision or judgment that produces an unwanted or unintentional result" when used as a noun, and "to be wrong about or to fail to recognize something or someone" when used as a verb.

  • The past tense of mistake is mistook.
  • The past participle of mistake is mistaken.

Verb forms of 'mistake'

I/you/they mistake • He/she/it mistakes
I/you/they mistook • He/she/it mistook
I/you/they will mistake • He/she/it will mistake
I am/you are mistaking • He/she/it is mistaking
I was/you were mistaking • He/she/it was mistaking
I/you will be mistaking • He/she/it will be mistaking
I/you have mistaken • He/she/it has mistaken
I/you had mistaken • He/she/it had mistaken
I/you will have mistaken • He/she/it will have mistaken
I have been mistaking • He/she/it has been mistaking
I had been mistaking • He/she/it had been mistaking
I will have been mistaking • He/she/it will have been mistaking

While both mistook and mistaken are correct past forms of the verb mistake, they are used in different contexts. Mistook is the simple past tense, while mistaken is the past participle used with auxiliary verbs.

When to use mistook vs mistaken

I mistook my friend for someone else and called out the wrong name.

The police officer realized he had mistaken the suspect for someone else.

Use mistook for the simple past tense and mistaken as the past participle with auxiliary verbs like "have," "has," or "had".

Sentence examples: mistake, mistook, mistaken

Mistake (present tense)

Examples:

• I mistake her for my sister sometimes.

• He keeps mistaking the correct answer to the question.

• We should encourage students to make mistakes.

Mistook (past simple)

Examples:

• I mistook my friend for someone else and called out the wrong name.

• I mistook the time of the meeting and arrived an hour late.

• She mistook my intentions and became upset.

Mistaken (past participle)

Examples:

• The police officer realized he had mistaken the suspect for someone else.

• I've mistaken her for her twin sister on several occasions.

• She seems to have mistaken your intentions and believes you meant to offend her.

Synonyms for "mistake"

Synonyms: blunder, lapse, miscalculation, misstep, aberration, fault, gaffe, inaccuracy, error, oversight, slip, snafu

Phrases with "mistake"

an honest mistake
A mistake made without intent to deceive or harm.
by mistake
Accidentally; unintentionally.
everyone makes mistakes
A phrase used to comfort someone who has made an error.
mistake someone for someone else
To confuse one person with another.
make no mistake about it
To be absolutely certain about something.

Origin of mistake

Mid-14c., “to commit an offense;” late 14c., “to misunderstand, misinterpret, take in a wrong sense,” from mis- (1) “badly, wrongly” + take (v.) or from a cognate Scandinavian source such as Old Norse mistaka “take in error, miscarry.”

Practice questions: Mistake conjugations

Question 1 of 5

I ______ his silence for agreement and continued with the plan.



She has often been ______ for her twin sister over the phone.



You are ______ kindness for weakness if you think you can take advantage of her.



Do not ______ my quiet nature for a lack of passion.



He often ______ my intentions, which leads to arguments.



FAQs

What is the simple past of mistake?
The simple past tense of "mistake" is "mistook." It refers to a past event, like in the sentence: "She mistook his silence for disapproval."
What is the past participle of mistake?
The past participle of "mistake" is "mistaken." It is used with auxiliary verbs like "have" or "had" to form tenses such as the present perfect or past perfect.
Are mistook and mistaken correct past forms?
Yes, both "mistook" and "mistaken" are correct past forms of the verb "mistake." Their proper usage depends on the specific tense you are trying to form.
When is mistook used correctly?
"Mistook" is used for the simple past tense. It refers to an event that began and ended in the past, like in the sentence: "I mistook my friend for someone else."
When is mistaken used correctly?
"Mistaken" is the past participle and is used with auxiliary verbs like "have" or "had." For example: "I have never mistaken her for anyone else" (present perfect).

Sources

  1. Harper, Douglas. "Etymology of mistake." Online Etymology Dictionary, https://www.etymonline.com/word/mistake. Accessed 28 July, 2023.
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