( 1)

1 are studying

2 Are they doing

3 don't stay

4 is getting

5 are you reading

6 stay

7 rains

8 did you get

(2)

1 saw, was swimming

2 was climbing, dropped

3 were walking, found

4 were you doing, phoned

5 stopped raining/wasn't raining, started

6 were you jogging, lost

(3)

1 mustn't tell

2 should try

3 must finish

4 mustn't be

5 shouldn't stay up

6  should/ people /get