2.      Who has already cleaned the room?

3.      When did you see the famous stars?

4.      Lily often speaks to her grandfather politely.

5.      Tom is washing clothes at present.

6.      They have planted thousands of trees in the last 3 years.

7.      He was doing his homework at this time yesterday.

8.      They must finish the work today.

9.      You should tell the truth to the teacher. (2)

10.  The boss made the workers feel angry in the past.

11.  Can you help the blind man cross the street?