🎓 Prepared by students from Boğaziçi University

What is Modal Have to?

Modal have to expresses strong necessity, obligation, and duty — something you must do because circumstances require it. Unlike 'can' or 'will', have to focuses on external pressure and legal/social rules.

Short answer

Have to expresses necessity and obligation. The affirmative is 'Subject + have/has + to + base verb' (I have to work); the negative is 'Subject + don't/doesn't + have to + base verb' (You don't have to attend).

Step-by-step worked examples

I have to finish my homework before dinner.

Subject: I
Modal: have to (+ base verb)
Base verb: finish
Tense: Present
Meaning: Necessity — it's required/obligatory

She doesn't have to wear a uniform at her new job.

Subject: She
Negative: don't have to + base verb
Base verb: wear
Meaning: Not necessary, not required, but allowed
Note: 'doesn't have to' ≠ 'must not'

Did you have to wait long at the doctor's office?

Subject: You
Past form: did have to + base verb
Base verb: wait
Tense: Past
Meaning: Was it necessary in the past?

Flashcards

Quick quiz

Q1.Which sentence uses 'have to' correctly?

Correct answer: B. 'Has to' is correct with 'she' (3rd person singular). Form: has + to + base verb.

Q2.'You don't have to attend.' This means…

Correct answer: C. 'Don't have to' = not necessary/optional. It doesn't forbid; it just removes obligation.

Q3.What is the past tense of 'I have to study'?

Correct answer: B. Past: 'had to' + base verb. 'I had to study for the exam.'

Q4.Which is NOT a use of 'have to'?

Correct answer: C. 'Permission' is shown by 'can' or 'may', not 'have to'. Have to = necessity.

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Common mistakes

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I have to goes to work. — Correct: I have to go to work. (Use base verb after 'have to', not 3rd person singular.)

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She don't have to study. — Correct: She doesn't have to study. (Use 'doesn't' with 3rd person singular.)

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'Don't have to' means 'must not'. — Correct: 'Don't have to' means 'not necessary'; 'must not' means 'forbidden'.

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He has to studied hard. — Correct: He has to study hard. (Use base verb, not past participle.)

FAQ

What is modal have to?

Have to expresses necessity and obligation — something you must do because it's required or necessary.

How do you form the negative with 'have to'?

Add 'do not' (don't) or 'does not' (doesn't) before 'have to': 'I don't have to work' (not necessary).

What is the difference between 'have to' and 'must'?

Both show necessity, but 'have to' emphasizes external obligation (rule, law). 'Must' emphasizes internal conviction.

Can 'have to' be used in the past?

Yes, the past form is 'had to': 'I had to finish my work yesterday.'