he would stop in Moscow on the way. 3.如果从句所述内容是客观真理,则谓语动词总是用一般现在时,而不受主句中谓语动词时态的影响.

eg. Miss Gao told us that light travels much faster than sound.             

  2.主句中的谓语动词如果是过去时态,从句中的谓语动词一般情况下要用过去时态的某种形式.     He said that he was working hard on his Chinese.

he had a very good journey home.     he hadn't bought the present yet.

  1.主句中谓语动词如果是现在时或将来时,从句中的谓语动词可以用任何所需要的时态,  he wants to speak to the headmaster.   He said that he won't be free tomorrow.    he came last night.

  2.表示过去某个时间之前发生的动作或状态, 一直延续到这一过去时刻,或还将继续下去.  eg. When I got to know him, he had worked there for twenty years.(注意) 否定式 had not == hadn't

时态的呼应

  用法： 1.表示在过去某一时间或动作之前已经发生或完成了的动作,动作发生的时间为“过去的过去“.表示过去某一时间可用by,before 等构成的短语,也可用when,before等引导的从句或通过上下文表示.   eg. By the end of last term,we had learned a thousand English words.

  He had finished his homework before his father came back last night.                

  6.--Where's Mary? --Oh,she _____the library.

A.has gone to    B.went to     C.has been to      D.had gone to

 H:过去完成时?表示过去某一时间或动作之前已完成的动作

 结构： 助动词had + 动词的过去分词

5.Mr and Mrs Green have_____in China for a week. A.been   B.got   C.arrived   D.reached            

  4.My father____ home for nearly three weeks.

A.has gone away from      B.has left   C.has been away from      D.went away                

3.So far,spaceships without people _______ (reach) the moon and some other partsof the universe. 

  2.--I know you _______ (choose) a picture book among these.  --Yes,Have a look at it, please.