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现在完成时主要用于两种情形：
情形1 描述一个发生在过去，但是对现在有一定影响的动作。
I have already seen the film.
我已经看过这部电影了。（不会再看了）
They have moved to another city.
他们已经搬到了另一个城市。（不住在这里了）
The new product has just been sent to our leader.
这个新产品刚刚寄给我们领导了。（新产品不在这里了）
情形2 描述一个发生在过去，一直持续到现在的动作。
Mr Brown has worked in this company for more than ten years .
布朗先生已经在这家公司工作了十多年了。
We ’ve known each other since 2015 .
我们从2015年起就认识了。
现在完成时的结构
注： has not = hasn’t have not = haven’t
请将下面每个句子中的错误改正，每题只有一处错误。
1. I work in this company for three years up to now.
_______________________________________________________________
2. Jimmy was never been abroad before.
_______________________________________________________________
3. My grandparents didn’t seen me for a few months.
_______________________________________________________________
4. We lived in this city since 2010.
_______________________________________________________________
5. Do you known each other for a long time?
_______________________________________________________________