пожалуйста даю 35 баллов!!!​

Ответ:

1. When i came home, my mother had already cooked dinner.

2. He had studied English before he entered the university.

3. Mother saw that Nick hadn't washed his hands.

4. I had finished me work when my son came into the room.

5. What had happened before the phone rang?

Объяснение:

правила грамматики