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11.12 比较since和for

      Since 用来说明动作起始时间,for用来说明动作延续时间长度。
      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.

      注意: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。)

      小窍门: 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) Tom has studied Russian for three years.
        = Tom began to study Russian three years ago, and is still studying it now.
      2) (错) Harry has got married for six years.
        = Harry began to get married six years ago, and is still getting married now.
      显然,第二句不对,它应改为 Harry got married six years ago. 或 Harry has been married for six years.

上一条11.11 用于现在完成时的句型 下一条11.13 since的四种用法

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