Complete the sentences with the past perfect form of the verb in brackets: 1) The streets were white because it had snowed during the night. (snow); 2) I suddenly remembered that I ______ the windows before I left the house. (not close); 3) We got to the cinema ten minutes after the film ______. (start); 4) Tina felt nervous when she got on the plane because she ______ before. (not fly); 5) Paul lent me the book after he ______ it. (read); 6) When Jack got back to the car park, he saw that someone ______ his car. (take)

1. The streets were white because it had snowed during the night.
2. I suddenly remembered that I had not closed the windows before I left the house.
3. We got to the cinema ten minutes after the film had started.
4. Tina felt nervous when she got on the plane because she had not flown before.
5. Paul lent me the book after he had read it.
6. When Jack got back to the car park, he saw that someone had taken his car.

Past perfect образуется с помощью had и причастия прошедшего времени; в отрицании используется had not.