Complete the sentences with can, could, must, have to, may 1. i am afraid i .... come to the party 2. who is that man

1. I am afraid I can\'t come to the party. 2. Who is that man with Ann? - I\'m not sure. It might/ may be her brother. 3. You mustn\'t tell anyone. 4. I can stay in bed tomorrow morning because I have to go to work. 5. You look tired. - Yes, I couldn\'t sleep last night.