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How to Use Don't and Doesn't?

Negation (saying 'no' or 'not') in present tense uses don't and doesn't. Like question formation, the auxiliary do/does moves to negative form. The pattern is simple: I/you/we/they + don't; he/she/it + doesn't.

Short answer

Use 'don't' with I/you/we/they (I don't like it) and 'doesn't' with he/she/it (She doesn't like it) to negate present tense verbs. Both mean 'do not' and 'does not' respectively.

Negation: Don't vs. Doesn't

1
I / You / We / They
Use don't: I don't like pizza.
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2
He / She / It
Use doesn't: She doesn't like pizza.
↓
3
Negative contraction
do not = don't; does not = doesn't

Step-by-step worked examples

Make negative: 'You like chocolate.'

Subject: You (uses don't)
Negation: don't + base verb
Negative: You don't like chocolate.

Make negative: 'He plays tennis.'

Subject: He (uses doesn't)
Negation: doesn't + base verb (remove -s)
Negative: He doesn't play tennis.

Make negative: 'They go to school.'

Subject: They (uses don't)
Negation: don't + base verb
Negative: They don't go to school.

Flashcards

Quick quiz

Q1.Negate: 'She likes ice cream.'

Correct answer: B. She (singular) uses doesn't: She doesn't like ice cream.

Q2.Negate: 'I understand this.'

Correct answer: B. I (first person) uses don't: I don't understand this.

Q3.Which is correct?

Correct answer: B. You uses don't: You don't like it.

Q4.What does 'doesn't' expand to?

Correct answer: B. Doesn't = does not (singular negation).

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Common mistakes

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Using 'don't' with he/she/it. — Correct: He/she/it use 'doesn't': He doesn't like it (not He don't).

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Using 'doesn't' with plural subjects. — Correct: Plural uses 'don't': They don't know (not They doesn't).

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Adding -s to the verb after don't/doesn't. — Correct: Base form: doesn't like (not doesn't likes).

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Using 'not' alone instead of don't/doesn't. — Correct: In present tense, use don't/doesn't, not just 'not': I don't know (not I not know).

FAQ

How to negate in present tense?

Use don't (I/you/we/they) or doesn't (he/she/it): I don't work, she doesn't work.

What's the rule for don't vs. doesn't?

Don't with plural/informal; doesn't with third singular. Same pattern as have/has.

Can I say 'I does not like'?

No. Use don't for I: 'I don't like it' (not I doesn't, I does not, or I not like).

Is 'doesn't' the same as 'does not'?

Yes — doesn't is the contraction. Both mean exactly the same.