1. Susana (had been living) in Germany for three month when she (started) going out with Reiner. At that time he (was training) to be a teacher and she (met) him at a college disco. 2. When I (heard) about the motorway accident on the radio, I immediately (phoned) my son to check that he (had got ) back safely. He ( told) me he (had taken) a different route home. 3. We (were watching) a particulary romantic scene of a film at the cinema when my boyfriend's mobile phone (went) off. He (had forgotten) to switch it off. 4. By the time we ( got) to the party they (had eaten) all the food. In fact, it was so late that most of the guests (had already left) and only two or three people (were still dancing).
Единственное, что меня смущает, так это обстоятельство в конце предложения. Его, я так понимаю тоже нужно изменять, иначе время невозможно изменить. 1) Colin celebrates his birthday in Moscow every year 2) Colin is celebrating his birthday now 3)Colin celebrated his birthday last Monday 4) Colin has celebrated his birthday for three days 5) Colin was celebrated his birthday yesterday at nine o'clock 6) Colin will celebrate hus birthday tomorrow 7) Colin will celebrate his birthday tomorrow at 9 o'clock
2. Гора Бен-Невис, находится в Шотландии.