Изменить предложения используя модальные глаголы may; must; can; need to; should.
11. If you want my advice, go to the dentist!
12. I'm sure they are at home. The lights are on.
13. If you don't stop eating so many cakes, you'll ha stomachache.
14. I'm sure she knows you are here.
15. They don't allow talking on the phone here, but most people do.
16. Maybe your friend will call you on your birthday.
17. He knows how to play golf.
18. It wasn't necessary for you to make your bed, they hotel staff would have done it.
19. It isn't necessary to do exercise 7.
20. Here's my advice: work harder.
!!

1) 
2) I am waiting for the bus...
3) ... are eating...
4) ... are flying...
5) Who are waiting ...

1) Is the sun shining now?
2) Are The children sitting on the grass now?
3) Are They looking at the sky now?
4) Are Some birds flying in the sky now?
5) Is She telling me about her plans now?

1)Peter isn't taking his fliend to the Tretyakov Gallery now.
2) He isn't doing his morning exercises now.
3) The Petrovs aren't moving to the new flat now.
4) Nobody is waiting for you in the kitchen now.
5) Kate isn't looking for her dog now.

1. do ... go: Present Simple (Indefinite), to go.
2. sleeps: Present Simple (Indefinite), to sleep; slept: Past Simple (Indefinite), to sleep.
3. did write: Past Simple (Indefinite), to write.
4. flows: Present Simple (Indefinite), to flow.
5. shall go: Future Simple (Indefinite), to go; will come: Future Simple (Indefinite), to come.
6. Look: Present Simple (Indefinite), to look; is snowing: Present Continuous (Progressive), to snow.
7. were doing: Past Continuous (progressive), to do; were having: Past Continuous (Progressive), to have.
8. don't come: Present Simple (Indefinite), to come; shall be writing: Future Continuous (Progressive), to write.
9. came: Past Simple (Indefinite), to come; were sitting: Past Continuous (Progressive), to sit; were watching: Past Continuous (Progressive), to watch.