Вставить модальные глаголы can, may, must, need1. Why ..... you understand it? It's so...

Question

Вставить модальные глаголы can, may, must, need
1. Why ..... you understand it? It's so easy.
2. You ..... not have bought the meat: we have everything for dinner.
3. ..... i offer you something to drink?
4. He .... not drink alcohol when he drives.

Answer 1

1.can
2.need
3.may
4.must

Answer 2

1. Why can you understand it? It's so easy.
2. You need not have bought the meat: we have everything for dinner.
3. May I offer you something to drink?
4. He must not drink alcohol when he drives.