Сделайте предложения, выбирете что правильно P.C. или P.S. и выбирете подункт из правила. Пример:
1.)(первое предложение) When I was coming…(это P.C(2))

1. came, was cooking, was working

2. were choosing, saw, was speaking

3. was writing

4. was dusting, was vacuuming

5. turned off, locked

6. returned, were sleeping

6. was getting, left

8. were you doing, phoned, was preparing

9. was Mike riding, met, was riding

10. did your sister finish, was reading, finished