英语四级语法:since和for用法比较
时间:2017-02-06 来源:文都网校 浏览:在英语四级考试中没有一道题是直接考查语法知识的,但是纵观整个试卷,语法知识却是无处不在的,因此,小编才说语法乃是英语四级阅读的基础知识点。以下是英语四级语法知识点:since和for用法比较,希望帮助大家夯实基础,顺利通关2017年6月英语四级考试。
英语四级语法:since和for用法比较
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.
以上就是英语四级语法知识点:since和for用法比较的全部内容,希望可以帮助大家更好地进行2017年6月英语四级阅读备考。
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