当since表示自从…… 然后主句是过去时,而从句大多是现在完成时,也有时候不是.

当since表示自从…… 然后主句是过去时,而从句大多是现在完成时,也有时候不是.
如何区分后边是否用不用现在完成时,麻烦各自举些例子加以说明
这个问题偶想弄明白,

since的四种用法
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980,last month,half past six).
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
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.