1. Before she worked in this factory , she had been married.
2. Because of the dnagerous acid rain, plant's leaves are damaged.
3. Unless try your best ,your result will be good .
4. Because it was rain heavily, the match was cancelled.
5. I haven't been to Bangkok before .
6. I have learnt English for 10 years .
7. After Kathy had done some exercrise, she had a shower .
8 . The last time we talked to each other was 2 weeks ago.
