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,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/18 11:38:27
![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,](/uploads/image/z/5662618-34-8.jpg?t=%E5%BD%93since%E8%A1%A8%E7%A4%BA%E8%87%AA%E4%BB%8E%E2%80%A6%E2%80%A6+%E7%84%B6%E5%90%8E%E4%B8%BB%E5%8F%A5%E6%98%AF%E8%BF%87%E5%8E%BB%E6%97%B6%2C%E8%80%8C%E4%BB%8E%E5%8F%A5%E5%A4%A7%E5%A4%9A%E6%98%AF%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%2C%E4%B9%9F%E6%9C%89%E6%97%B6%E5%80%99%E4%B8%8D%E6%98%AF.%E5%A6%82%E4%BD%95%E5%8C%BA%E5%88%86%E5%90%8E%E8%BE%B9%E6%98%AF%E5%90%A6%E7%94%A8%E4%B8%8D%E7%94%A8%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%2C%E9%BA%BB%E7%83%A6%E5%90%84%E8%87%AA%E4%B8%BE%E4%BA%9B%E4%BE%8B%E5%AD%90%E5%8A%A0%E4%BB%A5%E8%AF%B4%E6%98%8E%E8%BF%99%E4%B8%AA%E9%97%AE%E9%A2%98%E5%81%B6%E6%83%B3%E5%BC%84%E6%98%8E%E7%99%BD%2C)
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,
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,
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.
因为对现在有影响而且已经过去了
如果还是不懂,直接背句型就可以了