Teenagers mustn’t drink alcohol.
You don’t have to come tomorrow if you don’t want.
We must run or we will be late for the concert!
We lost our tickets yesterday so we had to buy new tickets to go inside.
You don’t have to put on all the warm clothes.
Parents must look after their children until they are 18.
You mustn’t smoke here.
Children don’t have to go to school on the summer holidays.
I didn’t want to leave but I had to go home.
Next month I must go to Paris for the internship.