1 When I tried to phone them, nobody answered. They all had gone swimming
2 He had changed so much that I almost didn't know who he was when I saw him last night
3 She couldn't phone me because she had lost her mobile.
4 Somebody had stolen John's car, so he was very angry.
5 Claire had no idea I was coming to see her. Her mum had forgetten to tell her.
6 You arrived too late. They had already left
7 Her mother had't given her any money, so she couldn't buy the tickets they had already returned from their holiday when you got to their house?
Если не сложно можешь пожалуйста сделать лучшим :)