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现在完成时for和since的用法解释及分析

时间:2021-05-12 08:29:28 语文百科 我要投稿

现在完成时for和since的用法解释及分析

  For和since都表示我们说到的时间从过去开始一直持续到现在,但是for与since不能混用。

  例如:

  “I have lived in Italy for 13 years.”

  “I have lived in Italy since 2003.”

  当我们用for的.时候,表示一个活动持续一段时间,从过去到现在。

  我们用since的时候,表示过去的行为开始一直持续到现在。

  两句话有同样的含义。for的例子中用了“13年”这个时间,但由于 2003年加上13年就是2016年,即今年。两句话的重点都是现在,“我”继续住在意大利,没有去其他国家。

  Since用来说明动作起始时间,for用来说明动作延续时间长度。

  给大家举一些例子, 什么时候该用for和since

  I have lived here for more than twenty years.

  I have lived here since I was born..

  My aunt has worked in a clinic since 1949.

  Some new oilfields have been opened up since 1976.

  I have known Xiao Li since she was a little girl.

  My brother has been in the Youth League for two years.

  I have not heard from my uncle for a long time.

  但是并非有for 作为时间状语的句子都用现在完成时。

  I worked here for more than twenty years.

  (我现在已不在这里工作。)

  I have worked here for many years.

  (现在我仍在这里工作。)

  当现在完成时+一段时间,这一结构中,我们用下面的公式转化,很容易就能排除非延续动词在完成时中的误使。

  1) (对)TomhasstudiedRussianforthreeyears.

  =TombegantostudyRussianthreeyearsago,andisstillstudyingitnow.

  2) (错)Harryhasgotmarriedforsixyears.

  =Harrybegantogetmarriedsixyearsago,andisstillgettingmarriednow.

  显然,第二句不对,它应改为Harrygotmarriedsixyearsago. 或Harryhasbeenmarriedforsixyears.

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