Complete the sentences. Put the verbs in the past simple or the past perfect.
1)My sister call to tell me I leave schoolbag at home.
2)When Sam turn on the TV, the concert finish
3)Peter not lend me the book because he not finish it yet.
4)My friend fail all his exams because he not study hard.
5)When they get to the hotel, they saw that somebody break the window.

1. My sister called to tell me I had left schoolbag at home.

2. When Sam turned on the TV, the concert had finished.

3. Peter didn't lend me the book because he hadn't finished it yet.

4. My friend failed all his exams because he hadn't studied hard.

5. When they got to the hotel, they saw that somebody had broken the window.

Объяснение:

Если в предложении два действия, надо смотреть, какое из них произошло раньше. То, что раньше идёт, будет в past perfect, а то действие, которое произошло позже, будет в past simple. Например: Когда я пришёл домой, мама уже приготовила ужин. Мама приготовила ужин раньше, чем я пришёл, это действие свершилось до нового действия, поэтому будет так :

When I came home, mum had already made dinner.