When the accident ……. (happen) that lorry was driving like a lunatic. I …… (never see) a lorry travelling so fast!

2. We …… (miss) the beginning of the play because it ….. (already start) when we arrived.

3. I …… (not recognise) my old teacher because we.....(not see) each other for 15 years.

4. When I ……(arrive) at her house I found she ……. (go out) so nobody was there.

5. My brother ……. (eat) all the cake before we …….. (get) home.

6. I ……. (understand) the film because I ……. (read) the book before.

7. Before she …… (buy) the flat she …… (look around) it several times.

8. I …… (not have) my book because I……. (lose) it the day before.

9. I ……. (study) English for two years before I …… (move) to N.Y.

10. She ……. (never see) a bear before she …... (move) to Alaska.

Ответ:

1 When the accident happened, that lorry was driving like a lunatic. (длительное действие past continuous прервано быстрым действием Past simple) I had never seen a lorry travelling so fast! (past perfect указывает на предшествующий опыт)

2. We missed the beginning of the play because it had already started when we arrived. (пьеса началась раньше, до нашего прихода)

3. I didn't recognise my old teacher because we hadn't seen each other for 15 years. (past perfect указывает на действие, происходившее до указанного момента в прошлом)

4. When I arrived at her house, I found she had gone out so nobody was there. (она ушла раньше, чем я пришел)

5. My brother had eaten all the cake before we got home. (брат съел весь торт до нашего прихода)

6. I understood the film because I had read the book before. (читал книгу раньше, чем посмотрел фильм)

7. Before she bought the flat, she had looked around it several times. (сначала осмотрела квартиру, потом купила)

8. I didn't have my book because I had lost it the day before. (потерял книгу днём раньше, поэтому ее не было)

9. I had studied English for two years before I moved to New York. (учил английский до приезда в Нью-Йорк)

10. She had never seen a bear before she moved to Alaska. (не видела медведя до переезда на Аляску)

Объяснение:

Past Perfect (had + V3) используется для обозначения действия, которое произошло до другого действия или момента в прошлом.