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.
从零开始学语法:'s与of 所有格之区别
从零开始学语法:延续性动词的用法特征
从零开始学语法:形容词比较级和最高级的用法
从零开始学语法:英语分数的表示法
从零开始学语法:基数词和它的修饰语
从零开始学语法:英语不规则动词变化表
从零开始学语法:连系动词及系表结构
从零开始学语法:情态动词如何表猜测
从零开始学语法:some 和 any 的用法
从零开始学语法:can have done用法小结
从零开始学语法:可以说 asleep children 吗?
从零开始学语法:at school 等于at the school 吗?
从零开始学语法:具有连接作用的副词
从零开始学语法:英语中的专有名词
从零开始学语法:不可数名词
从零开始学语法:非延续性动词的用法特征
从零开始学语法:方位介词辨析
从零开始学语法:序数词的表达法
从零开始学语法:人称代词全掌握
从零开始学语法:定冠词 the 的用法
从零开始学语法:双重所有格&独立所有格
从零开始学语法:动词如何接"ed"
从零开始学语法:情态动词must与have to的用法
从零开始学语法:时间介词辨析(上)
从零开始学语法:快速搞定物主代词
从零开始学语法:英语中的五种短语动词
从零开始学语法:及物动词与不及物动词
从零开始学语法:基数词能否加"s"?
从零开始学语法:need是实义动词or情态动词?
从零开始学语法:情态动词can与may的用法
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