英语的应用越来越广泛了，我们必须好好来学习英语知识。对此威廉希尔app 小学频道编辑为大家整理了小学六年级英语语法讲解：比较since和for。详情如下：

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.

希望大家能够认真阅读这篇小学六年级英语语法讲解：比较since和for，以便在英语学习上取得优异的成绩。

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