II. 1. think-is knock
2. have written
3. circles
4. are working
5.have you seen
6. flows
7. is crying
8. is smoking
9. goes
10. are- have been
11. belongs
12. has lost
13. am- have forgotten
14. have waited
15. Have you ever seen
III.
1.haven't saw
2.saw
3.been
4.have read
5.What did you do
6.Did you watch
7. was
8.has written
9.have taught
10.have-learned