I
1, had built
2, arrived
3, had taken
4, had seen
5, had rained
6, hadn’t used
7, hadn’t brought
8, had turned
II
1, It was the first time I had ever seen such an awful tornado.
2, By the time we got there, they hadn’t cleared up the debris.
3, Before the storm struck, most people had moved to safe areas.
4, Had you experienced such a hot summer as 2000 before?
5, By 11 o’clock last night, the mudslide had buried the whole village.
6, The captain realized that the ship had stuck an iceberg.
III
1, Incorrect: was retired -> retired
2, Correct
3, Incorrect: left -> had left
4, Correct
5, Correct
6, Incorrect: took -> had taken
7, Correct
