4. When I (to come) home, Kate (to play) the piano.

Объяснение:

When I came home, Kate was Playing the piano

Came, playing

Объяснение:

1. doctor

2. grocer

3. trainer

4. actor

5. butcher

6. hairdresser

7. baker

8. dentist

9. teacher

10. singer

1. at, in

2. from, to, on

3. to, about

4. from, under

5.by, on, to