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. 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. 【查看更多】
