must mustn't

This week we'll learn about...

Must, Must not (Mustn't), have to, don't have to.

Must AND MUSTN'T

WE USE MUST AND MUSTN'T TO TALK ABOUT RULES AND OBLIGATIONS.

RULES AND OBLIGATIONS

EXAMPLES: Afrimative You must switch off your mobile phone in class. Negative You mustn't eat or drink in the classroom.

- we / forget Mum's birthday

Let's practice:

write complete sentences with Must or Mustn't.

- my cousin / wear large earings to school

- You/ walk on the grass

+ you / practise for an hour everyday

+ they / fill in the form

+ You/ be careful

write sentences using Must / mustn't.

Have to / don't have to

You have to pay taxes

We use have to to say that something is necessary and don't have to to say something is not necessary.

You have to study for your test

Example: You have to bring sandwiches= you need to bring them.

She has to pay the car insurrance.

Negative: But you don't have to bring any drink. I mean, it's not necessary.

He doesn't have to buy a present for his girlfriend.

Must and have to

Mustn't and don't have to are different Mustn't is for restrictions, prohibitions. You mustn't be late for class (You can't be late, this is the rule) You don't have to buy a membership. ( It is not necessary that you buy the membership)

they are similar We can say: I've got a test this Friday. I have to study or I must study