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思马得英语100个句子搞定英语语法(29):关于完成时态的注意点

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  29.关于完成时态的注意点

  <例句>

  I won't believe you until I've seen you in the room with my own eyes.

  我要亲眼见到你在这个屋子里才相信你。

  <语法分析>

  在时间和条件状语从句中,可用现在完成时态代替将来完成时。延续性动词可用于现在完成时,可接表示段的时间状语。非延续性动词也可用于现在完成时,但不接表示段的时间状语。有时在口语中,可用一般过去时代替现在完成时。有些动词,如hope, plan, mean, expect和think等有时可用过去完成时来表示一个本来打算做而未做,曾经设想而未实现的事情。在时间和条件状语从句中,过去完成时可代替过去将来完成时。

  <触类旁通>

  (1) He has got constant help from her since he has known her.

  自从他认识她以来,他一直得到她的帮助。

  语法分析:为了强调从句谓语动词从过去某一时刻开始,一直延续到现在,可用现在完成时态。

  (2) I have never heard of her since she left.

  自她离开后湖,我从未听说过她。

  语法分析:since从句如果用现在完成时,其谓语动词一定是延续性的,如果是非延续性的,则只能用一般过去时。

  (3) The vistors have stayed here for three days.

  来访者在这儿住了三天。

  语法分析:延续性动词可用于现在完成时,可接表示段的时间状语。

  (4) The young man has joined the Party.

  这年轻人入了党。

  语法分析:非延续性动词也可用于现在完成时,但不接表示段的时间状语。

  (5) I had intended to come over to see you, but was prevented from doing so.

  我本打算来看望你,但受阻没有来成。

  语法分析:用过去完成时来表示一个本来打算做而未做,曾经设想而未实现的事情。

  (6) We would get into trouble as soon as the water had run out.

  水一用完,我们就会陷入困境。

  语法分析:在时间和条件状语从句中,过去完成时可代替过去将来完成时。

  <巩固练习>

  (1) When you _____[learn] computer, you'll find it a bridge to so much knowledge.

  (2) The film _____[put] on at this cinema for three days.

  (3) I _____[meet] him twice this morning.

  (4) I _____[hear] of you before.

  (5) This is the most wonderful film I ____[see}.

  (6) In the last few years there _____[be] great changes in computers.

  (7) She must _____[be] here last week.

  (8) He should _____[let] us through the forest yesterday evening.

  (9) The old man _____[live] here since 1980.

  <参考答案>

  (1) have learned (2) has been put (3) have met (4) have heard (5) have ever seen (6) have been (7) have seen (8) have let (9) has lived


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