Ответ:

1) I watching TV when the phone is ringing.

2) They singing while he playing the guitar.

3) While they sleeping i working.

4) When i opening the door, the dog attacking me.

5) It raining when he waking up.

6) What she does when you coming back?

7) The students writing while the teacher speaking.

8) We eating when they entering.

9) She looks for her watch when she see it .

10) What you do when Tom arriving?

Примерно так, удачи