Подчеркнуть правильный вариант(определить время). 1. how long had you been waiting/were you waiting before the bus arrived? 2. pam went/had gone out with her friends after she had finished her homework. 3. we couldn’t leave the lab until we had cleaned/had cleaned the culture plates first. 4. i lost my keys as i was walking/had beem walking home. + перевод. и можно с объяснениями, почему выбрали это, .

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.
1. Как долго вы ждали до прибытия автобуса?
2. Пэм пошла со своими друзьями после того, как закончила домашнее задание.
3. Мы не могли покинуть лабораторию, пока мы сначала не очистили культуральные планшеты.
4. Я потерял ключи, когда шел домой.