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. |