Have to / Must / Should

HAVE TO, MUST & SHOULD are verbs which we use for obligation and recommendations.

Use SHOULD to make a recommendation (i.e. when you think it is a good idea for someone to do something).  Example: You should do some grammar exercises to improve your English. 2. You should drink 6 glasses of water a day.

Use HAVE TO for laws or strong external obligation.  Example: You have to wear a seat belt when driving. 2. In my country, you have to be 16 years old to buy cigarettes.  Note that the negative of have to is mustn’t, can’t or not be allowed to.   For example: You mustn’t drink and drive.  2.  You can’t smoke in restaurants in Malta.  3.  We aren’t allowed to use our phones in class.

HAVE GOT TO is used in the same way as HAVE TO.  The only difference is that it is less formal so it is more common in speaking.

Use DON’T HAVE TO for things that aren’t necessary or you don’t need to do.  For example: You don’t have to pay for children under the age of 6.  2. We don’t have to do any schoolwork in the summer holidays.

Use MUST for personal obligation.  Example:  I must study for my exam tomorrow. 2. I must eat less ice-cream!  I’m getting fat.

Note that in many situations it makes no difference if you say MUST or HAVE TO.  The difference is one of degree or how strong the obligation is.  For example: I have to / must get more exercise.

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Have to / Must / Should

Complete the gaps in the sentences with HAVE (GOT) TO, MUST and SHOULD

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Grammar Rule: HAVE GOT TO means the same as HAVE TO.

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She ___________ (doesn't have to / mustn't) go to the party if she doesn't want to.

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I __________ (have got to / have to ) do my homework.

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I lost my handbag at the café in the airport. It wasn't there when I went to find it. Someone _________ (must have taken / had to have taken) it.

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Grammar Rule: Use ___________ ( don't have to / mustn't) when there is no obligation or need to do something.

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Do you think we _________ (should / ought to) book a taxi for the airport?

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Complete the rule. Use HAVE TO for …...............

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In my country, you _________ (have to / should ) be 18 years old to drive a car.

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Emma hasn't visited Ashley yet. She _________ (mustn't / hasn't to) know she is in hospital.

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I'm getting fat. I _______ (must / have to) start going to the gym again.

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Grammar Rule: HAVE GOT TO is less formal than HAVE TO.

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Doctors and nurses _________ (have to / should) work at night sometimes.

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OUGHT TO is another way of saying SHOULD.

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You ___________ (don't have to / mustn't) hurry. You have plenty of time before your flight.

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Grammar Rule: It is possible to use CAN'T / NOT ALLOWED TO instead of mustn't.

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He knows all the football players. He _______ (must / has to) watch a lot of football.

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When I saw the doctor, he told me that I _________ (had to / must) take the medicine for 5 days.

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His car is in front of his house. He _______ (must be / has to be) home.

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I _________ (mustn't / don't have to) do any homework today. The homework we have is for next Friday.

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In many situations, you can use both MUST or HAVE TO. For example: I must / have to study.

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You _________ (have to / should) wear a seatbelt when driving.

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Complete the rule. Use MUST for …...............

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You _________ (don't have to / mustn't) use the internet when you are on the plane.

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You ___________ (mustn't / can't / don't have to) park here. It is not allowed.

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You ________ (don't have to / shouldn't) drink more than 3 cups of coffee a day.

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When you get sick, you ________ (should / must) drink a glass of hot water with honey and vinegar.

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He ____________ (mustn't / doesn't have to) wear a uniform to work.

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The children ____________ (should / have to) wear a uniform to school.

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You _________ (don't have to / mustn't) use your telephone when driving.

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He _________ (doesn't have to / mustn't) eat any milk products. He is allergic to milk.

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That bag is really nice! It __________ (must have been / had to have been) very expensive!

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If you want to learn English grammar, you ___________ (should / must) do some grammar exercises.

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Grammar Rule: Use ___________ ( don't have to / mustn't) when there something is prohibited or not allowed.

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She has an exam tomorrow. She really __________ (must / has to) study.

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We _________ (don't have to / mustn't) book the train tickets in advance. We can buy them at the station.

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Learn the difference between must and have to. Use must for internal obligation (something important for you) and have to for external obligation (i.e. laws and regulations)

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