3 речення з can,3 з may,3 з must

1) May I go out?2) He may be at work.3) You may call me tonight.1) You can`t do it!2) Can I sit here?3) If you have some free time, we can go for a walk.1) I must go to doctor next week.2) You mustn`t leave without permission!3) She isn`t at school, so she must be ill.