一、 while 用作名词时,意为“一段时间,一会儿”.例如：
I stayed there for a short while.
The postman came a short while ago.
二、 while 用作连词时,有以下几种含义：
You can go swimming while I'm having lunch.
While I was watching TV, the bell rang.
Meimei watched TV while she ate her supper.
They were grinning and watching while one man laughed and poured beer over the head of another...
We must have been burgled while we were asleep.
Her parents died while she was still at school.
While I was waiting at the bus stop, three buses went by in the opposite direction.
I sat on the settee to unwrap the package while he stood by
While I am willing to help, I do not have much time available.
While the modelling business is by no means easy to get into, the good model,male or female, will always be in demand
While it was late, he went on working.
While he is in poor health, he works hard.
I looked a bit stiff while they were so lively.
While Tom's very good at science, his brother is absolutely hopeless.
Marianne was tempted to turn the large rooms into traditional French-style salons, while Howard was in favour of a typically English look...
He went out for a walk, while I stayed at home.
I like singing while she likes dancing.
You like sports, while I prefer music.
5. 到…时；直到…为止 （until）
I waited while six o'clock.
三、 while 引导状语从句时,应注意以下几点：
1. while 引导的时间状语从句既可放在句首,也可放在句末；而 while 引导的让步状语从句一般放在句首,不放在句末.另外,也可以从意义上加以区分.例如：
While the news, so far, has been good, there may be days ahead when it is bad.
While he was tired, he went on working.
（ while 引导让步状语从句）
While he was tired, he would have a rest.
（ while 引导时间状语从句）
2. while 引导让步状语从句时,如果从句的主语和主句的主语相同,那么从句的主语和谓语动词 be 都可以省略.例如：
While he was ill, he went there. （= While ill, he went there.）
3. while 和 when 都可以引导时间状语从句,但应注意： while 引导的时间状语从句中的谓语动词必须是延续性的动词或表示状态的动词；而 when 引导的时间状语从句中的谓语动词既可以是延续性动词,也可以是非延续性动词.当时间状语从句中的谓语动词是延续性动词时, while 和 when 可以互相替换.例如：
While we were talking, the teacher came in.
The bus had left when we arrived at the bus stop.
（ arrive 是非延续性动词,因此,此句中的 when 不能用 while 替换.）
When / While we were having a meeting, our teacher came in.
（ have 是延续性动词,因此,句中的 when 可以用 while 替换.）
while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态. 例如：While they were talking ,the bell rang.正在他们谈话的时候,上课铃响了.
I was doing my homework when my mother came back home yesterday evening.昨天晚上妈妈回家的时候,我正在做家庭作
4. while 引导的状语从句还可以表示“某个动作正在进行的同时,另一个动作也在进行之中”.例如：
While the teacher was speaking, the students were listening.
While he was writing, I was reading
I filled the kettle while she was talking and plugged it in
while you're/I'm etc. at it
I'm just going to buy some postcards.’ ‘Can you get me some stamps while you're at it?’
四、辨析when as while 【导航词义：当…时】
when conj. 在…时，当…时
He got engaged to Lucy when travelling last autumn.
It was raining when we arrived.
Turn off the switch when anything goes wrong with the device.
as conj. 当…时，（正当）…的时候
She was coming in as he was going out.
I caught a whiff of perfume as she swept past me.
Joe jumped onto the bus just as it was pulling away.
while conj. 当…时，在…期间
Don't interrupt him while he is thinking.
She got married while working as a waitress.
Pat killed time by watching TV while waiting for her.