объясните пожалуйста хотя бы на одном примере, заранее спасибо

ним весело.он у меня самый лучший друг. напишите пожалуйста на англииском

что способствует этому и т.д) хотя бы предложении 10-15

заранее спасибо

Сделайте упражнение 3, тест 5, 6....хотя бы то, что знаете)
Заранее спасибо:З

1. You ___ enter this area without permission. It’s forbidden.
a) mustn’t b) shouldn’t c) don’t have to d) may not
2. You ___ have gone to bed by now. It’s really late.
a) must b) could c) have to d) should
3. You ___ not call him now. I think he’s busy.
a) must b) might c) can d) ‘d better
4. You ___ go now. I allow you.
a) may b) can c) should d) must
5. The police ___ be questioning the suspects now. I’m sure of it.
a) might b) will c) must d) should
6. We’re not quite sure. He ___ be asked to testify in court.
a) will b) might c) must d) needn’t
7. If you ___ the alarm, get onto the deck quickly.
a) hear b) will hear c) heard d) are hearing
8. If you heat water, it ___ .
a) will boil b) boils c) would boil d) will be boiling
9. If I saw someone trying to break in, I ___ the police.
a) called b) would have called c) ‘ll call d) ‘d call
10. If I ___ you, I would go and see the doctor.
a) was b) would be c) were d) had been