Ex4

1. have never

2. has read

3. read

4. had

5. haven't seen - saw

6. hasn't drunk

7. have studied

8. When did he start

9, How long has he learnt

10. lost

11. has just run

12. has travelled

V/

Ex1

1. were palying

2. was watching

3. was watching - was reading - was doing - was playing

4. was having

5. was doing

6. was watering

7. were visiting

8. were doing

9. was feeding

10. were learning

Ex2

1. arrived - was still sleeping

2. went - were having

3. was having - stopped

4. arrived - was still sleeping 

5. were crossing  - saw

6. saw - was standing 

7. were playing - came

8. rang - was taking 

9. was sitting - saw 

10. were cleaning - came 

VI/ 

Ex1

1. had finished

2. had already started

3. had moved

4. had gone

5. had been

6. watched - had done

7. had cleaned

8. had gone

9.  had been 

10. had been.

$Ex4.$

1/ have never

2/ has read

3/ read

4/ had

5/ haven't seen-saw

6/ hasn't drunk

7/ have studied

8/ When did he start

9/ How long has he learnt

10/ lost

11/ has just run

12/  has travelled

__________________________________________

$V.$

$Ex1.$

1/ were palying

2/ was watching

3/ was watching-was reading-was doing-was playing

4/ was having

5/ was doing

6/ was watering

7/ were visiting

8/ were doing

9/ was feeding

10/ were learning

_____________________________________________

$Ex2.$

1/ arrived-was still sleeping

2/ went-were having

3/ was having-stopped

4/ arrived-was still sleeping 

5/ were crossing-saw

6/ saw-was standing 

7/ were playing-came

8/ rang-was taking 

9/ was sitting-saw 

10/ were cleaning-came 

___________________________________________

$VI.$

$Ex1.$

1/ had finished

2/ had already started

3/ had moved

4/ had gone

5/ had been

6/ watched-had done

7/ had cleaned

8/ had gone

9/ had been 

10/ had been