MUST
When we think that something is necessary, we use must.
If you use must in the negative form means that something is forbidden.
Negative form: must + not = MUSTN'T
HAVE TO
When we are in a special situation and think that doing something will be necessary, we use HAVE TO.
For negative forms we use the auxiliary verb DO/DOES followed by NOT:
don't have to.../ doesn't have to....
EXERCISES
1.-Write five rules about what you must or mustn't do at school.
- ..................................................................( use mobile phones)
- ................................................................(smoke)
- ................................................................(pay attention)
- ................................................................(run along corridors)
- ................................................................(be on time)
2.- Choose the right form:
- Children under 18 must/mustn't drive cars.
- I must/mustn't do my homework. It's for tomorrow.
- Look at the flag on the beach, it's red, he must/mustn't swim in the sea today.
- She must/mustn't take the camera, it isn't hers.
- It is a private garden, they must/mustn't pick up the flowers.
3.- Make a sentence with each situation:
- The doctor: do exercise.............................
- My mun: get the newspaper.......................
- Your friends: tonight at our home...............
- Our teacher: wait a minute.........................
- Your brother: make less noise....................
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