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真题吧 >> 英语语法 >> 比较since和for

比较since和for

作者：fs88.cn　来源：网络　时间：2008-09-18　加入收藏

　　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.

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