Ответ:
- By eight o'clock yesterday I had done my homework and at eight I was playing the piano.
- By six o'clock father had come home and at six he was having dinner.
- By nine o'clock yesterday grandmother had washed the dishes and at nine she was watching TV.
- When I met Tom, he was eating an ice cream which he had bought at the corner of the street.
- When father came home, we were cooking the mushrooms which we had gathered in the wood.
- When I saw Ann, she was sorting the flowers which she had picked in the field.
- When I came home yesterday, I saw that my little brother had broken my pen and was playing with its pieces.
- When I opened the door of the classroom, I saw that the teacher already had come and the pupils were writing a dictation.
- When I came home, my sister was reading a book which she had brought from the library.
- When mother came home, the children were eating the soup which she had cooked in the morning.
- When I rang up Mike, he still was learning the poem which he had begun learning at school.
- When I looked out of the window, the children were playing with a ball which Pete had brought from home.
- By ten o'clock the children had settled comfortably on the sofa and at ten they were watching a film on TV.
Past Simple обозначает завершённое событие в прошлом, Past Continuous — действие, происходившее в определённый момент, а Past Perfect — действие, завершившееся раньше другого события в прошлом.
