=>
Ex1/
1. don't belong
2. is coming/don't want
3. flows
4. is flowing
5. grow/aren't growing
6. do you smoke
7. usually enjoy/don't enjoy
8. is/is staying/stays
9. starts
10. does your father fo/isn't working
11. always do
12. are shouting
13. don't you wear
14. don't work
15. will help/finishes

II/
1. has had
2. arrived/had/went
3. Did you often visit
4. did you give 
5. didn't eat/didn't feel
6. Have you washed 
7. has worked
8. has lived
9. have been
10. Have you met/Have never met

III/
1. fell/was painting ( qkđ + while + qktd)
2. Were you watching ( qktd + when + qkđ)
3. wasn't driving/happened
4. broke / was doing/slipped
5. didn't go/was raining
6. were you doing ( at this time yesterday > qktd)/ was feeding
7. saw/wore

IV/
1. was/ had run
2. had gone / didn't feel 
3. had rung/was 
4. told/had lived
5. had waited/brought
6. had driven