在某些固定句型里往往有固定的时态要求,请体会下列句子中时态的运用:
1.This/It is the first/second... time I have done sth.
That/It was the first/second... time I had done sth.
2.It is two years since he went abroad./It was two years since he had gone abroad.
3.I was about to go out when the telephone rang.
4.Hardly had I got home when the telephone rang.
5.No sooner had I got home than the telephone rang.
6.It won't be long before he comes back./It wasn't long before he came back.
7.I didn't manage to understand it until he had explained it again.
8.祈使句+and(or/or else/otherwise)+并列分句(并列分句中谓语动词多用一般将来时)
三、被动语态
1.被动语态的构成
英语中的及物动词一般都有主动语态和被动语态两种形式。主动语态是无标记的,而被动语态则是有标记的。被动语态由“助动词be+过去分词”构成。助动词be随着主语的人称、数、时态和语气的不同而变化。被动语态的各种时态形式见下表:
2.主动形式表示被动意义的几种情况
(1)英语中有很多动词,如break,catch,clean,drive,look,open,sell,read,write,wash等,当它们被用作不及物动词来描述主语特征时,常用其主动形式表达被动意义,主语通常是物;在这种情况下,常常和easily,well等副词连用。
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