问题1:请问have been 与 have gone的区别
老师回复:have been to 表示去了某地,已经回来;have gone to表示去了,但没回来.
例如:
I have been to France three times. 我已经去过法国三次了.
The man you saw can not be Tom. He has gone to France on business.
你看见的那个人不可能是Tom.他去法国出差了。
问题2: 老师,请问When,while,as,前后应该加的时态是什么?
老师回复:
as 常用于:
1 表书两个发展变化中的情况:
As you grow older, you'll know better and better about yourself.
2 表示 一边 一边 :
They talked happily as they walked along the river.
3 表示随着短暂动作的发生,另一行为伴随发生:
My cap was blown away as I sat down.
问题3: 老师,请问When,while,as,前后应该加的时态是什么?
老师回复:when, while,as的区别并不在时态上,时态的确定要根据句子中的时间状语.
这三个连词中,when 用得最广,常可代替while 与as.与while比较,when 所引导的从句,动词既可是延续性的,也可是终止性的。as在这一点上与when 相同,while所引导的从句中,动词只能是延续性的。例如:
The telephone rang when I was taking a bath.
All the students were sleeping soundly when the fire broke out.
两个延续性动作同时发生又具有对比意味时,用while,在这样的复合句中,主从句的时态通常上相同的。例如:
Father was preparing a report while I was playing games.
While I played the violin, my sister did her homework.
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