Question

when和as soon as的区别

You should always say "Hello" _______ you see a classmate on the street.

a. when
b. while
c. as soon as
男老师说答案是as...as，when是错误。 另一个女老师说 as...as... 是错误的，正确的答案是when. 他们把我搞的糊涂了。

Answer 1

when,while ,as soon as
这三个词都有"当……时候"之意,但用法有所不同,使用时要特别注意.
①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续性动词.如：
When I got home,he was having supper.我到家时,他正在吃饭.
When I was young,I liked dancing.我年轻时喜欢跳舞.
②while只指"时间段",不指"时间点",从句的动词只限于持续性动词.如：
While I slept,a thief broke in.在我睡觉时,盗贼闯了进来.
辨析
①when从句与主句动作先后发生时,不能与while互换.如：
When he has finished his work,he takes a short rest.每当他做完工作后,总要稍稍休息一下.(when = after)
When I got to the cinema,the film had already begun.当我到电影院时,电影已经开始了.(when=before)
②when从句动词为终止性动词时,不能由while替换.如：
When he came yesterday,we were playing basketball.昨天他来时,我们正在打篮球.
③当从句的谓语是表动作的延续性动词时,when,while才有可能互相替代.如：
While / When we were still laughing,the teacher came in.正当我们仍在大声嬉笑时,老师进来了.
④当从句的谓语动词是终止性动词,而且主句的谓语动词也是终止性动词时,when可和as通用,而且用as比用when在时间上更为紧凑,有"正当这时"的含义.如：
He came just as (or when) I reached the door.我刚到门那儿,他就来了.
⑤从句的谓语动词如表示状态时,通常用while.如：
We must strike while the iron is hot.我们应该趁热打铁.
⑥while和when都可以用作并列连词.
Mike is tall while his brother is short.迈克的个子很高,然而他弟弟很矮.
Mary was on her way home when two big boys stopped her.玛丽正走在回家的路上,这时两个大个子男孩拦住她.
as soon as的用法：
（1）、as soon as one can
= as soon as possible 表示“尽可能快”之意,如：
① You must ring me up as soon as you can.
你必须尽快给我打电话.
② Please write to me as soon as possible.
请尽早给我写信.
（2）、as soon as 引导时间状语从句,表示“一……就……”.如果主句用将来时或情态动词或祈使句,从句必须用一般现在时代替将来时.如：
I’ll tell him the news as soon as he comes.
他一来我就告诉他那消息.
She may come as soon as she finishes the work.
事情一做完她就可以来.

Answer 2

as soon as是：一……就……；一经；不久后，一会儿
when 是 在…时; 既然; 如果;
用as soon as 是 句子意思： 在路上，你一看到你同学就应该打招呼。
用when 是： 在路上看到你同学时，你就应该打招呼。

从句意上理解的话 两个都说得过去
但是我个人认为还是选A 因为比较习惯用when ，也可以说是语感吧