Page 43 - Grasp English A2 (Grammar Book)

Saving Challenge 7

Must, have to, mustn’t, don’t have to Expressing obligation

We use must and have to to talk about something which is necessary or required.

Requirement consists of rules, laws, or prohibition.
We must wait at the red light. You have to wait at the red light.
You must bring your books to school every day. You have to get up early.

We use mustn’t to talk about things that we aren’t allowed to do. It is against the law or rules. It also
expresses prohibition.
You mustn’t cross the street at the red light.
You mustn’t smoke in this building.

We use don’t have to to show that something is not necessary.
We don’t work on Saturdays, so you don’t have to come to the office.
You don’t have to take medicine any more because you are very well now.

We use can’t to show that something is prohibited or not permitted.
You can’t use drugs in this country.
You can’t bring your pet to the restaurant.

We use needn’t to show that something is not necessary. We can use don’t have to instead of needn’t.
You needn’t buy any vegetables. We have got a lot at home.
You don’t have to buy any vegetables. We have got a lot at home.

A. Complete the sentences using have to, don’t have to, has to, or doesn’t have to.
Example:
The children are happy today because they don’t have to go to school.
Sally has to go to work today because the boss is coming.
1. We cook dinner tonight because we are going to eat at the restaurant.

2. My mum make a cake because it’s my sister’s birthday today.
3. Mary is on holiday this week, so she get up early.
4. Jeremy is only four years old. He go to school.
5. My mother can’t see very well. She wear glasses.
6. You stay at the hotel. You can stay at my house.

7. I can’t play football today. I paint my house. It looks terrible.
8. We wear a dark suit and a tie to the meeting.
9. They know our new address. We text them.
10. You can stay up late tonight because you get up early tomorrow.

11. I can’t go out with you tonight because I finish my homework.
12. My shirt is dirty. I change it.

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