1. As soon as everyone leave the room, I'll tidy it.
2. Before he going to bed, he did his homework.
3. Before he going to bed, he did the home.
4. We will go to the park when we have done the housework.
5. I will send the letter after I wrote it.
6. I sent the letter after I wrote it.
7. I feel terrible. I think I will be sick soon.
8. He worked hard all yesterday morning.
9.  A: Why are you filling that bucket with water?
     B: I am watering the flowers.
10. By September last year, we lived here for 10 years.
11. We're sure he got a good mark.
12. By January next year, I had this car for 5 years.
13. By 7 a.m tomorrow, I read her books for 3 days.
14. This time tomorrow I read books.