Упр.2 Часть 3c Рабочая тетрадь ГДЗ Spotlight 8 класс

Приведем выдержку из задания из учебника Юлия Ваулина, Джунни Дули 8 класс, Просвещение: 2 Underline the correct item.
1 How long had you been waiting before the bus arrived?
2 Pam went out with her friends after she had finished her homework.
3 We couldn’t leave the lab until we had cleaned the culture plates first.
4 I lost my keys as I was walking home.
*Цитирирование части задания со ссылкой на учебник производится исключительно в учебных целях для лучшего понимания разбора решения задания.

1. How long had you been waiting before the bus arrived? — Past Perfect Continuous is used for an action that was in progress before another past action.

2. Pam went out with her friends after she had finished her homework. — Past Perfect shows the earlier action.

3. We couldn’t leave the lab until we had cleaned the culture plates first. — Past Perfect is used because the cleaning happened before leaving.

4. I lost my keys as I was walking home. — Past Continuous describes an action in progress when another past action happened.