27. You look tired today.

26. What were you doing at ten o’clock yesterday morning?

25. Would you please…?

24. I’m sorry to trouble you.

23. What was he/she drawing when…?

22. I hope so.

21. I’m sure (that)… I’m not sure if… I’m not sure what to…

20. It seems to be an interesting book.

19. I don’t think you’ll like it.

18. It must be very interesting.