ОЧЕНЬ НУЖНА ПОМОЩЬ))))Вставьте модальные глаголы can, may, must или need. 1. I ... do it today: it is the last day. 2. ... I open the window? – No, you … (not). 3. We ... not take the teacher’s book. 4. We ... not come to school in June. There are no lessons. 5. Will he come to see us? – I don’t know. He … or he … not. 6. Shall I phone him today? - No, you ... not, he is busy, but you … phone him tomorrow. 
7. ... I cut it without a knife? – No, you … (not), it’s dangerous. 8. You ... not have bought the vegetables: we have everything for dinner.9. Why ... not you understand it? It is so easy.

1. I must do it today: it is the last day.2. May I open the window? – No, you must not.3. We must not take the teacher’s book.4. We don't need to come to school in June. There are no lessons.5. Will he come to see us? – I don’t know. He may or he may not.6. Shall I phone him today? - No, you must not, he is busy, but you can phone him tomorrow. 7. Must (May) I cut it without a knife? – No, you must not, it’s dangerous.8.You need not  have bought the vegetables: we have everything for dinner.9. Why can't you understand it? It is so easy