2. Must or Have to?

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I
Must expresses strong obligation and necessity:
Seat belts must be worn even in the back of the car.

IIWhat's the difference between MUST and HAVE TO?

1. Must is used when the speaker decides that something needs to be done.

2. Have to is better if somebody else other than the speaker has made the decision.

Example Who made the decision
"I must buy new clothes. Look at these pants: they're all worn out. The decision to buy new clothes comes from me.
"I have to buy new clothes. I'm starting in my new job next week and they are really strict about the dress code." The company (someone other than me)

IIIWhen someone else has to do something, we usually use have to instead of must.

"Robbie can't come with you, because he has to work tonight."
IVMust is only used in the present tense (and sometimes to express the future).
We use a form of have to for the other tenses.

The past tense of MUST is HAD TO:

I had to pay my debt yesterday.
She had to give a presentation to her class.
MUSTN'T or DON'T HAVE TO?

Mustn't = must not means that something is not allowed.
Don't have to means something is allowed, but it's not necessary to do it.
Fill in the missing modal verbs.

- must
- mustn't
- have/has to
- don't/doesn't have to

1. We have a lot of work tomorrow. You ___ be late!




2. The museum is free. You ___ pay to get in.




3. You tell anyone what I just told you. It's a secret.

4. Children tell lies. It's very naughty.

5. John isn't a millionaire yet, so he go to work.

6. I do my washing because my Mum does it for me.

7. You smoke. It's not allowed indoors, and it's bad for your health anyway.

8. Lisa clean the floor today, because it's her turn. (Look at Box III)

9. We rush. We've got plenty of time!

10. I spend too much money today, as I've only got a little left.

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