Since 用来说明动作起始时间，for用来说明动作延续时间长度。

例句：

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.