choose
You must/mustn't get to class late.
You mustn't get to class late.
I ....... go to work.
I mustn't go to work.
Can you use a mobile in the class?
ability
can
You must/don't have to bring books to school every day.
You must bring books to school every day.
Visitors ..... get too close to lions.
Visitors mustn't get too close to lions.
Can you cross the street when the light is red?
No, I can't.
obligation
must
Pupils have to/has to be polite.
Pupils have to be polite.
You ..... become rich and famouse.
You don't have to become rich and famouse.
Must pupils wear school uniform?
Yes, the must.
necessary for you
have to
She doesn't have to/ hasn't to set the table.
She doesn't have to set the table.
...... I eat in the classroom?
Can I eat in the classroom?
Does your friend have to study hard?
Yes, he does.
no need to do somethig
don't have to
Does he have to/ has he do the test tomorrow?
Does he have to do the test tomorrow?
What do children always..... do?
What do children always have to do?
Do Chineese students have to wear slippers at school?
Yes, the do.
prohibition
mustn't