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21. He has been watching TV since morning. (Present Perfect Continuous.)

22. Tomorrow I am having an English class at 8 o'clock.(Present Continuous)

23. The air in the city is becoming more and more polluted. (Present Continuous)

24. I've lost my purse. (Present Perfect)

25. Her hair is dirty. She has been painting the house the whole day long.

(Present Perfect Continuous.)

26. You are always losing something! (Present Continuous)

27. You have already been  writing the composition for two hours. (Present Perfect Continuous).

1. «may/might I talk to your boss?» he asked.
2. The children may go for a walk tonight.
3. She said that they might smoke there.
4. Andy was allowed to leave school early yesterday because he was feeling unwell.
5. She told me that I might stay a little longer that night.
6. You may take the book home and keep it for a week.
7. They  are allowed to leave their seats and walk up and down the class.
8. She is allowed to go home in a few days.
9. may I ask you to repeat the rule again?
10. Drivers are allowed to go at 40 kilometres an hour here.