Have To Vs Don'T Have To

Use must + infinitive without to

Must is a modal verb, & modal verbs are followed by an infinitive without to.

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I must go to the doctor. (NOT I must lớn go lớn the doctor.)No -s

Modal verbs don’t địa chỉ cửa hàng -s after he/she/it.

He must come with us. (NOT He must comes with us.)Use must/mustn’t in negatives & questions

Must is an auxiliary verb. This means that it has a negative and an interrogative form. Vì not use do/did in negatives & questions.

We mustn’t arrive early. (NOT We don’t must arrive early.)Must we arrive early? (NOT bởi we must arrive early?)

have to/don’t have to

Use dodid in negatives & questions

The verb have in have to is not an auxiliary verb. Use do/don’t, does/doesn’t, did/didn’t in questions & negative sentences in present và past.

Do you have to get up early tomorrow? (NOT Have you to lớn get up early tomorrow?)Did you have to buy a new sound card?We don’t have to stay until the end.No contraction

The verb have in have to cannot be contracted to ‘ve.

I have khổng lồ study for the exam tomorrow. (NOT I’ve khổng lồ study for the exam tomorrow.)Past & future forms

Only have to has a past và a future form. Must does not have a past or a future form.

Yesterday, I had to take a taxi. (NOT Yesterday, I must take a taxi)You will have to take a xe taxi if it rains tomorrow. (NOT You will must take a taxi.)

must vs have to / mustn’t vs don’t have to – meaning

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have to

Rules & obligations

We use have to lớn talk about rules và obligations, something that is necessary.

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I have khổng lồ get to lớn work before 7 tomorrow.The oto broke down & we had khổng lồ call a taxi.

must

Rules và obligations

Must is very similar khổng lồ have to. We use must + infinitive (without to) to lớn talk about rules và obligations.

I must go lớn the doctor.I must get up early tomorrow.

don’t have to

Don’t need khổng lồ – not necessary

If you don’t have to vày something, it means that you ‘don’t need to’ vày something (there is no obligation). You can bởi it but you don’t need to vì it if you don’t want to vì it.

You don’t have lớn pick me up at the station. I can take a taxi. (=You can pick me up, but you don’t need to bởi it).

mustn’t

Prohibition

Use mustn’t to lớn talk about something that you can’t do. It’s necessary that you don’t bởi it.

You mustn’t call me before 8. (=You can’t điện thoại tư vấn me before 8.)I mustn’t lose my concentration now.

must vs have to

must

Obligation from the speaker

We normally use must when to talk about obligations that come from the opinion of the speaker. The speaker thinks it’s necessary or important to bởi something.

MANAGER: You must get up early tomorrow. The meeting is at nine. (=The obligation comes from the manager. The manager thinks it’s necessary.)DOCTOR: You must stop smoking. (=It’s the doctor’s opinion. The doctor thinks it’s necessary.)SMOKER: I must stop smoking. (=It’s the smoker’s opinion. The smoker thinks it’s necessary to stop smoking.)

have to

External obligation

We normally use have to when there’s an external obligation. The obligation doesn’t come from the speaker’s opinion; another person thinks it’s necessary.

WORKER: We have to lớn get up early tomorrow. The meeting is at nine. (=The obligation comes from the manager, not from the worker.)SMOKER: I have lớn stop smoking. (=It’s the doctor’s opinion, not the smoker’s opinion. The doctor thinks it’s necessary.)

mustn’t vs don’t have to

don’t have to

You don’t need to vì chưng it; not necessary; no obligation

Don’t have tomustn’t have opposite meanings. We say that we don’t have to vì something when we don’t need to vị something; we can do it, but it’s not necessary.

You don’t have to lớn wait here. (=You can vì chưng it, but it’s not necessary)

mustn’t

Prohibition; it’s necessary that you don’t vày it

We say that we mustn’t bởi vì something when we cannot bởi something; it is necessary that we don’t bởi vì something.

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