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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).

(I). Yes, sir. What can 1 do for you?
(M). My car has been stolen
(J). Stolen, you say. Are you sure? You haven't just forgotten where you parked it? A lot of people do, you know. 
(H). No. it's been stolen. I parked it in the car park near Clark Street and now it's gone. 
(E). And you parked it in the Clark Street car park. When was that sir? 
(F). At quarter past ten this morning. 
(A). Right, sir. Then I'd better take some details. Can you describe the vehicle. please? 
(K). Yes, it's a red Ford Escort 1.6l.
(N). And the registration number?
(L). M654 JKY
(D). And when did you return to the car park?
(B), About half an hour ago.
(C). Well, sir. We'll do our best to find the vehicle. 
(G). Thank you.