5 предложений со словом must по Английски.
5 предложений со словом may по Английски.

А где may?

I must go to school. I must visit my grandmother. I must read the book. I must do my homework. I must help my father. 

Jack may be upset. I can't really tell if he is annoyed or tired.

Jack may have been upset. I couldn't really tell if he was annoyed or tired.

Jack may get upset if you don't tell him the truth.

May I make a phone call?

You may leave the table when you finish your dinner.