9、過去完成時

John had learned some Chinese before he came to China. He found the book that he had lost.

By the end of last year， I had worked in this college for ten years.

no sooner………than， hardly(scarcely)……when(before)

We had no sooner reached home than it began to rain. No sooner had we reached home than it began to rain.

He had hardly entered the office when (before) the phone rang.

10、現(xiàn)在完成進行時(常跟for hours， since this morning等表示一段時間的狀語連用)

They have been watching TV for two hours. He has been working on this essay since this morning.

11、時態(tài)呼應(yīng)特殊規(guī)則

Kepler proved that the sun is the center of the solar system. 客觀真理

I didn‘t go to the ball because I am not fond of dancing. 意義需要

被動語態(tài)

一般時態(tài) 進行時態(tài) 完成時態(tài)

現(xiàn)在 am

is written

are am

is being given

are has

been written

have

過去 was

were written was

were being given had been written

將來 shall

will be written shall

will have been written

過去將來 should

would be written should

would have been written