1. Sue can't have/must have been at the party last night. She's on holiday in Italy right now. 2. Karen may/has to leave school early tomorrow. She has a dentist appointment after school. 3. If Mary gets permission from her parents, she may/must study in France next year. 4. Students mustn't/needn't run in the school corridors. It's against the rules.
2) i’m cooking tonight
3) Is he seeing the doctor tomorrow?
4) are you eating chocolate?
5) what are you doing?
6) are we making a mistake?
7) you are coming tomorrow
8) it’s snow
9) John is sleeping at the moment
10) he aren’t dancing
11) how are they getting here?
12) when is it starting?
13) i’m not speaking Chinese at the moment
14) Is Jill drinking tea now?
15) is he paying the bill at the moment?
16) i’m staying with a friend for the weekend
17) when is John arriving?
18) are they coming to the party?
19) we aren’t studying
20) am i being silly?