小升初必备语法:比较since和for

小升初必备语法:比较since和for
日期:11-07 20:51:07| 小升初英语|45教学网| http://www.45sw.com

小升初必备语法:比较since和for是关于小升初辅导 - 小升初英语方面的资料,

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.

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