when while as 都可以互相替换吗?如果是,要在什么情况下可以互换?

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when while as 都可以互相替换吗?如果是,要在什么情况下可以互换?

when while as 都可以互相替换吗?如果是,要在什么情况下可以互换?
when while as 都可以互相替换吗?如果是,要在什么情况下可以互换?

when while as 都可以互相替换吗?如果是,要在什么情况下可以互换?
when,as,while这三个词都可以引出时间状语从句,它们的差别是:when 从句表示某时刻或一段时间,有“当……时”的意思;
as 从句表示进展过程,有“随着,一边……一边”的意思;
while 只表示一段持续的时间,有“在……的同时”的意思.
例如:
When he arrived home,it was just nine o'clock.
当他到家时,正是九点钟.
As he grew older,he became more intelligent.
随着他年龄的增长,他变得更有才智了.
While she was typing the letter,the telephone rang.
当她在用打字机打那封信时,电话响了.

从考试的角度讲,每个词都有自己的强调重点,是不是可以这样理
1.作“当......时候”讲时,三个词没什么区别,都可以用,但要记住while从句中的动词必须是延续性的。如:
We left when/while/as he was sleeping in his bedroom.
但下面这句话就不能用while了:
While he got up, he felt ...

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从考试的角度讲,每个词都有自己的强调重点,是不是可以这样理
1.作“当......时候”讲时,三个词没什么区别,都可以用,但要记住while从句中的动词必须是延续性的。如:
We left when/while/as he was sleeping in his bedroom.
但下面这句话就不能用while了:
While he got up, he felt dizzy.(错误,因为get up不是延续性动词,应该用另外两个)
2.考试中常考特殊性,如:当有“一边......一边......;随着......”含义时要用as;当表示“突然......”这个含义时要用when;当表示“尽管......;然而”含义时要用while:
He sings as he works.
I was about to leave when the telephone rang.
The population density per mile in the United States is twenty-two people,while that in Canada is two people.在美国,没平方英里的人口密度是22人,而在加拿大是2人。
看看下面的句子是不是有两种理
While he was in jail,they were able to talk frequently.
尽管他在狱中,但他们当时还是能够经常谈话。
或是:他在狱中时,他们可以经常谈话。
看看下面这道题选什么:
--I'm going to the post office.
--_____ you're there,can you get me some stamps?
A.As B.While C.Because D.If(全国高考,99)
标准答案B,但A不对吗?个人感觉这题有问题。
Also sail travel is very safe and I am never sick on a train, ____ I am on a ship!
A.when B.while C.as D.and 答案:C.这是个as引导的非限制性定语从句。

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