$Ex4.$
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
