距离2019年12月大学英语四级考试还有不到40天时间，考生们准备得怎么样啦?文都四六级小编为大家精心准备了2019年12月英语四级语法：比较since和for，来了解一下吧，更多四级语法、六级语法请关注文都四六级网站。
英语四级语法：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.
以上就是这次分享的2019年12月英语四级语法：比较since和for，不知道大家都掌握了吗?更多四级语法、六级语法请持续关注文都四六级网站。
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