1.Haf she helped Mother about the house from 2 till 6 pm yesterday?
2. They often take a bus.
3. Martin hasn't already get up.
4. He is writing a letter by the time she comes.
5. The weather was bad a week ago
6. The river is flowing very fast today, faster than usual
7. Has she have the test in a week?
8. Yesterday the children did their homework while their Mother was cooking supper
9. We will discuss a very important question that time tomorrow
10. Have the guests gone away by the time he came home yet?
11. We are having dinner now.
12. Nowadays travelling abroad becomes less popular
13. Did your friends finish this work by last Saturday?
14. They didn't sleep at 9 o'clock last night
15. Look! The room is very dirty. They don't still to clean it up!