10．It will be long before we take over the city.

　　　　　　 It was several years before construction of the building was started..

9．　 I didn’t think you were coming today.

8．　 It is necessary that we should learn hard so as to pass the examination.

7．　 He didn’t see the result until he left.

It was not until then that he knew he had been cheated.

6．　 The man seems as if he had been there many times

I would have seen the film if I had had time yesterday.(虚拟语气)

5．　 The manager will see you if he is free tomorrow.

4．　 It is high time that you did your homework.

3．　 Jimmy had hardly go to the station when the bus left.

2．　 This is the first time I have been here.

That was the second time I had been there.

1．　 It is several years since I saw her last time.

It was several years since I had saw him.