> Plus de cours et d'exercices d'anglais sur le même thème: Modaux [Autres thèmes]
	> Tests similaires: - Modaux: CAN/MUST-cours pour débutants - Modaux-cours pour débutants - Modaux - Modaux : Permission/obligation/possibilité - Modal can (video) - Conseils: should, had better, ought to (cours pour débutants en anglais) - Modaux : emplois - Can = to be able
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Must / Have to - cours

                                            MUST                              HAVE TO

                     Must and have to are used to express obligation or the need to do something

                     they can be used interchangeably however

 ---MUST:    (subjective obligation)  in general expresses what the speaker thinks  is necessary

                 I must stop smoking  / We must go it's already midnight  /They must work harder

 __HAVE TO:   (objective obligation)  in general suggests that somebody else has imposed the decision

                     In France you have to drive on the right / Tom has to wear a uniform at school

 ----Tenses

            1° have to can be used in all tenses:

                      Tom had to wear a uniform last year  /  Tom will have to wear a uniform next year

                      Sonia is having to wait  / she may have to come back tomorrow

            2° must can be used to talk about the present or the future

                     Tom must call his mother tomorrow

                but it can't be used to talk about the past  ( you use have to)

----Interrogative form 

                       Do you have to leave now?    /   Must you leave right now?

----Negative form

                  The negative form of must and the negative form of have to are very different in meaning

          1° must not / mustn't   is used to say that something is not allowed

                  Children mustn't play with fire   /   Passengers must not talk to the driver  /  Visitors mustn't smoke 

                  'must not 'can't be used to talk about the past, you use another structure

                  example: we were not allowed to park near the museum

          2° don't have to  means that there is no obligation to do something, but you can do it if you want

                  you don't have to drink alcohol, you can have a soft drink

                  she doesn't have to arrive before 9

                                                  when the lights are red you must stop

                                             you  have to stop

                                                                                       you mustn't go on 

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1. To drive a car you musthas todon't have to have a driving licence.
2. While you are driving you mustmust notdon't have to listen to the radio, it is not necessary.
3. You mustmustn'tdon't have to drive without wearing a seatbelt.Wear a seatbelt is compulsory for the passengers too.
4. It is dangerous to talk on a cell-phone and drive at the same time. Drivers mustshouldshouldn't do that.
5. In some countries it is illegal to use a cell-phone in a car, in those countries drivers don't have tomustn'tshould use phones in their cars.
6. Drivers shouldmust notmust be kind to other drivers
7. But they don't have todoesn't have tomust not be kind to other drivers, it's a choice not the law.
8. In France you mustn'thave tohas to insure your car, it's the law of the country.
9. On the road you don't have tomustmust not respect the speed limit even if there isn't any radar.
10. Cyclists don't have tomustn'tmust wear a helmet but a cautious rider should have one.