1. Last night, while I was studying in my room, my roommates were having party in the other room.
2. The storm destroyed the sand castle thay we had built.
3. He hadn’t been in CT before 1997.
4. When she went out to play, she had already done her homework.
5. My brother ate all of the cake that our mum had made.
6. Had he phoned Angie before he went to see her in London?
7. She hadn’t ridden a horse before that day.
8. Kevin had gone home by the time I arrived.
9. Mum was annoyed because I hadn’t cleaned my room.
10. Had they studied English before they went to the USA.
11. By the time you arrived at the stadium, the train had left.