1. is running - present continuous (PC)
has been running - present perfect Continuous (PPC)
2. are doing - present continuous
are working - present continuous
have been working - present perfect Continuous
3. is - PS (x2)
is playing - PC
have been playing - PPC
4. live - PS
have been living - PPC
5. has been doing - PPC
hasn't done - PP
6. have been waiting - PPC
7. are doing - PC
8. am reading - PC
have been reading - PPC
have read - PP
9. have been doing - PPC
10. is - PS
helps - PS
Has been helping - PPC
have washed - PP
are cooking - PC
11. works - PS
has been working - PPC
12. Have found - PP
am looking - PC
have been looking - PPC
haven't found - PP
13. Have been playing - PPC
Go, do - PS
14. Wake - PS
have been slepping - PPC
15. have been waiting - PPC
haven't received - PP
16. Have received - PP (x2)
17. is - PS
has been shining - PPC
got - past simple
18. wind - PS
19. Come - PS
are doing - PC
have been waiting - PPC
20. are - PS
have put - PP
1. My fellow-students can handle any hotel work, can't they?
2. I don't have to call for a cab myself, do I?
3. The doorman doesn't have to carry the hotel guests' luggage, does he?
4. The receptionist can't escort the guests to their rooms, can he?
5. The guests can complain any time, can't they?
6. The assistant manager has to handle complaints, hasn't he?
7. The guests mustn't leave their room key in the door, must they?
8. The bellboys have to run errands, don't they?
9. The guest may not leave the message here, may he?
10. The receptionist must assign rooms, mustn't he?
11. I may leave my luggage with the receptionist, can't I?
12. I needn't pay for the in-house video, did I?
Как-то так
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