10.When I came to the station,the train already leaved.
11.We will not grow tomatoes next summer.
12.Have you ever been to Piccadilly Circus?
13.What did you buy at the shop yesterday?
14.If it is not raining tomorrow,we will not stay at home.
15.When he comes tomorrow,I will still doing my homework.
16.Look!My friends are playing football.
17.He hasn't read Turgenev since he was pupil.
19.Does Lena usually do her homework at school?No,she doesn't.
18.Will you write the letter by the time she comes tomorrow?
20.What did you do at 6 o'clock yesterday?