Помогите сделать английский язык 8 класс по теме: Past Perfect.Учебник Биболетова,может кто- нибудь уже делал)

1 The boy had never heard the name of that pianist before the concert.
2 The terrible tornado had destroyed half of the village by that time.
3 The pilot had finished his flight by 11 o'clock the day before yesterday.
4 When the teacher came , the students had already gathered their though.
5 Had you already found the documents when they arrived?
6 Nick had changed his mind after I phoned him.