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LOWER INTERMEDIATE - GRAMMAR


MUST & HAVE TO

When do we use MUST and when do we use HAVE TO?
They have exactly the same meaning.

PRESENT TENSE
In the present tense you can use either. It doesn't matter.
I must telephone Bob later.
I have to telephone Bob later.

OTHER TENSES
In the other tenses we use have to. We never use must.

My foot hurts. I will have to see the doctor I think.
Yesterday I had to walk three kilometres in the snow.
I had to sing in front of the whole school yesterday. I was so embarrassed.
I will have to buy a new coat for winter.

NEGATIVE
mustn't = obligation
don't have to = no obligation

You mustn't smoke here. (=not allowed)
You mustn't drive faster than 100 kilometres per hour. (=not allowed)
You don't have to do this homework. (=you can choose)
You don't have to wash the dishes. (=you can choose)

Put in the missing words.
Examples:
She play tennis tomorrow.
The
clean the schoolyard now.

1. I leave now.
2. She
ring her mother yesterday.
3. He
will study hard next year.
4. We be ready for any emergency.
5. They go to bed at 7pm when they were young.

6. She work last weekend
7. It will wait until tomorrow.
8. She
not be late.
9. I do some work now.
10.She does go to school tomorrow.

 
Go back to Grammar Book.