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Obligation

Hello everybody !

Do you know how to use « don't have to » or « mustn't » ?

In the affirmative, have to and must have a similar meaning,

but the negative forms ( don't/doesn't have to and mustn't) are completely different in meaning.

 How to find the right words between « don't have to » or « mustn't » ?

English people use don't/doesn't have to when it isn't necessary to do something (but you can do it if you want to),

but they use mustn't when it's necessary not to do something (it's dangerous, or forbidden !)

In the following exercise, choose « don't have to » or « mustn't » :

Good luck ...

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1. You doesn't have todon't have tomustn't Je ne sais pas drive without a seatbelt.

2. John doesn't have todon't have tomustn't Je ne sais pas pay for me !

3. You doesn't have todon't have tomustn't Je ne sais pas smoke in the lift.

4. We doesn't have todon't have tomustn't Je ne sais pas go home yet, it's only 9:30 PM.

5. You doesn't have todon't have tomustn't Je ne sais pas stay out so late, you're sick and it's bad for you.

6. I doesn't have todon't have tomustn't Je ne sais pas forget my mother's birthday again !

7. Children doesn't have todon't have tomustn't Je ne sais pas wear a uniform in all schools.

8. You doesn't have todon't have tomustn't Je ne sais pas leave without saying 'good-bye' !

9. You doesn't have todon't have tomustn't Je ne sais pas buy me flowers every time you see me ! But it's very nice.

10. I've told you before. You doesn't have todon't have tomustn't Je ne sais pas touch that hot stove.