Помогите составить 4 диалога со словами May, mest,can.

1.  -May I leave? -Yes, you may, but you must do that in the break time.  2.  -Will you go swimming today? -I must, but I'm not sure I can.  3.  - May I ask a question, sir? - Yes, of course  you can.  4.  -You must not copy homework from the other students.  -But how can we get good grades then???