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11.  I'd rather you didn't smoke in the dining room. 

12.  It took three and half hours to  fly to Moscow.

12. This shirt isn't clean enough for me to wear .

13.  I am used to getting up early in the morning.

14. Would you mind helping me? / Would you mind giving me a hand ?

15. If he didn't speak so quickly, I could understand him.

16.  It is such a heavy suitcase that I can't carry it.

17.  I suggest that you should ask her yourself. 

18. When did you last see Mary? 

19.  It took three and half hours to  fly to Moscow.

20. She asked Tom how many Japanese students there were in his class .