Is It Mistook or Mistaken: Exploring the Correct Past Tense of “Mistake”
Quick Answer
The past tense of mistake is mistook. When you use it with have, has, or had, the form is mistaken. For example: “I mistook her for someone else” and “I have mistaken the address.”
Mistake, Mistook, Mistaken — See the Pattern
Look at these sentences. Can you see how the verb changes?
- I often mistake salt for sugar. (now, present)
- Yesterday, she mistook me for my sister. (past)
- He has mistaken the time of the meeting. (with has)
- We had mistaken the road and got lost. (with had)
Did you see the pattern? The verb mistake changes like this:
| When | Form | Example |
|---|---|---|
| Now (present) | mistake | I mistake names sometimes. |
| Past (on its own) | mistook | She mistook the door. |
| With have/has/had | mistaken | They have mistaken the date. |
This follows the same pattern as take → took → taken. If you know that pattern, you already know this one. You are doing great.
When to Use Mistook and When to Use Mistaken
Mistake is an irregular verb. It does not follow the normal “-ed” rule. Here is how to know which form to use:
Use “mistook” when:
- The action happened in the past
- There is no “have,” “has,” or “had” before it
- Example: “He mistook my kindness for weakness.”
Use “mistaken” when:
- You see “have,” “has,” or “had” before it
- You use it as a describing word (like “a mistaken idea”)
- Example: “You have mistaken my words.”
Easy way to remember: Look for “have,” “has,” or “had.” If one of these words is there, use mistaken. If not, use mistook.
The Rule in One Line: Mistook = past on its own. Mistaken = with have/has/had.
How to Use Mistook and Mistaken in Everyday English
- I mistook the sugar for salt and ruined my coffee. (past — no have/has/had)
- She mistook my brother for me at the shop. (past — happened once)
- Sorry, I have mistaken you for someone else. (with have)
- They had mistaken the meeting time, so they arrived late. (with had)
- That was a mistaken idea — it did not work. (used as a describing word)
You are doing great. Now let us look at the mistakes many learners make.
The Most Common Mistake With Mistook and Mistaken
Even advanced learners mix up mistook and mistaken sometimes — so if you get confused, you are not alone. Even native speakers make this one wrong now and then.
The biggest mistake? Using “mistook” after have/has/had:
✗ I have mistook the address.
✓ I have mistaken the address.
✗ She has mistook you for her friend.
✓ She has mistaken you for her friend.
✗ He mistaken the exit and got lost.
✓ He mistook the exit and got lost.
How to remember: Think of “take.” You would never say “I have took” — you say “I have taken.” It is the same with mistake: “I have mistaken,” not “I have mistook.”
Other verbs like this: take → took → taken, shake → shook → shaken, forsake → forsook → forsaken.
Test Yourself: Mistook or Mistaken?
Choose the correct answer for each sentence. Click Check to see if you are right.
1. She _______ him for his brother at the party yesterday.
2. I have _______ the address. That is why we are lost.
3. He _______ the salt for sugar this morning.
4. You must have _______ my message.
5. They _______ the exit and drove the wrong way.
Keep Going — You Are Building Something
You just learned the three forms of mistake. That is one more irregular verb you will never get wrong again.
You know how mistake follows the same pattern as take → took → taken. But did you know the verb forget follows a different pattern? Most learners mix up forgot and forgotten — do you know when to use each one?
Next lesson: Forget, Forgot, Forgotten — When to Use Each One
Source
Harper, Douglas. “Etymology of mistake.” Online Etymology Dictionary
My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.
