A: What are you doing this evening?
B: I am not sure I MAY go to the cinema.
A: Are you busy?
B: Yes. I MUST finish this project tonight.
A: Can I go to John's party, Dad?
B: You can but you MUST be home early.
A: Are you coming with us to the beach?
B: I MAY come but I don't know yet.
A: We MAY have a barbecue next week.
B: Oh, that's great! Call me when you know for sure