While的用法：
一、while作名词用，表示“一会儿”“一段时间”
1.She likes to lie down for a while after lunch.
她喜欢午饭后躺一会儿。
2.Coming to another country to study requires a big adjustment and it takes a while to fit in.
来到另一个国家求学，需要花一段时间来适应。
二、While作连词
(1)引导时间状语
1.We must strike while the iron is hot.趁热打铁。
2.While she was listening to the radio，she fell asleep.
她听着收音机睡着了。
(2)引起让步状语从句，意思是“虽然…但是….”、“尽管…但是…”(多放于句首)
1.While he loves his students，he is very strict with them..
虽然他爱他的学生，可是他对他们很严格。
2.While these experiments are interesting and useful，it is important to remember that they may not always tell us much.(BookIIIp125)
虽然这些实验很有趣也有用，但是很重要的是要记住，这些实验也可能不会告诉你很多。
(3)引起条件状语，意思是“只要”
1.While there is life there is hope.只要生命存在，就有希望。
2.While there is a way there is away.有志者事竟成。
三、While作并列连词用，意思为“而，然而”，表对比。而but表转折。注意用心比较体会while与but的句中用意
1.Some people waste food while others haven't enough.
有些人很费粮食，然而有些人却吃不饱。
while语句都可以用for改写
2.The son was having a good meal at home，while the parents were working in the fields.
儿子在家吃好饭而父母却在田里辛勤劳作。
3.I ought to have helped her，but I never could.
我本该帮她但没能。
4.Honey is sweet，but the bee stings.
蜂蜜很甜，但蜜蜂有刺蜇人。
四.while，when，as的用法区别
都译为“当…的时候”，
区别为：
when后的从句谓语动词既可是延续性动词，也可是短暂性动词，而且还可作并列连词，译为“这时”。
但以下句型一定用when，作并列连词：
句型A：be about to do…when…正要做…这时(发生另一事)
句型B：was/were doing…when…正在…这时(发生另一事)
句型C：had done…when…刚要做…这时(发生另一事)
1.We were about to set out when it began to rain.
我们刚要出发天突然下雨了。
2.He had hardly sat down when his mobile rang.
他刚一坐下手机就响了。
3.I was walking along the bank of the river when I fell into it.
我正沿河岸散步突然掉进水里。
while后的从句谓语动词只能是延续性动词，强调主从句的两个动词同时发生；while也可作并列连词，表示两个动作的对比，译为“而”“然而”。
1.While his mother was cooking in the kitchen，the boy fell asleep in the chair.
(在一个延续动作过程中发生另一个动作)
as则表示两个变化中的动作的同时性，译为“一边…一边…”。
2.He hurried home，looking behind as he went.
他匆匆回家，边走边往后看。
■巩固练习：
一.改错
1.She is fat but I am thin.
2.It was raining while we arrived.
3.She sang while she walked.
4.I don't know them well，while they are my neighbors.
二.选择最佳答案：
1.She thought I was praising her child，_____，in fact，I was scolding him for his bad behaviors at school.
A.what
B.while
C.so that
D.therefore
2.I do every single bit of housework____my husband Bob just does the dishes now and then.(2004全国卷II35)
A.while
B.since
C.when
D.as
3.______it is expected that students come university
with the ability to take a good set of notes，this is not always the case.
A.When
B.As
C.For
D.While
4.We were swimming in the lake___suddenly the
storm started.
A.when
B.while
C.until
D.before
5.---You seem to have had that car for years.
---Yes，it's in good condition，but I should sell it____it still runs.
A.if
B.before
C.because
D.while
答案：一1.but改成while。因为fat与thin形成对比
2.while改成when。因为arrived为短暂动词
3.while改成as。表示“一边…一边…”
4.While they are my neighbors，I don't know them well.主句和从句颠倒位置。
二.1.选B。while并列连词，表对比，意为，“而，但是”
2.选A.while含有对比之意，意为“然而”。
3.选D.在此句中while表示“尽管”。
4.选A。wasdoing···when···一个固定句式。
5.选D.意思为“趁着···”
Although （尽管, 虽然；但是, 然而）
与though（虽然; 尽管；然而; 但是）的用法及区别：
1.两词同义并可换用，但although语气较重，通常放在句首并用于正式场合。如：
I'd quite like to go out, (al)though it is a bit late. 我很想外出，虽然为时稍晚。
Although it was snowing, it was not very cold. 虽然下着雪，但并不很冷。
2.用though 时，可将强调的词前置，但although 不能。as也有此种倒装结构。如：
Poor though / as he is , he is happy.虽然他穷，但过得很愉快。
Child though / as she was, the actress was drawing a crowd. 尽管还是个孩子，这个女演员却引起了人们的注目。（child前无冠词a）
3. although 引导从句常指事实，而though 引导的句子可表假设。如：
Let's start as arranged though it rains tomorrow. 即使明天下雨，咱们也按预定的计划出发吧。（假设）
He was not unhappy although he had to live alone. 虽然得一个人生活，他毫无不快之感。（事实）
4.although 只用作连词，而though 除作连词外，还可用作副词，常置句末，句子较长时，也置于句中。如：
It's hard work, I enjoy it though. 这是苦差事，可我干得颇有乐趣。
There's no excuse, though, for hurting her feelings. 伤到她的感情一事，还是不可原谅。
5.though 可用于even though, as though 等结构，although则不能。如：
Even though I fail, I'll keep on trying. 我纵然失败，仍会继续尝试下去。
You look as though (=as if ) you know each other. 看起来你们好像彼此认识。
6. although 和 though 用作连词时不能和but连用，但可跟yet, still 等连用。如：
Although he lives alone, yet he is happy. = He lives alone, but he is happy. 他虽然单独生活，但很愉快。
7.though 常用于省略句。
如：Though (he is) alone, he is happy.

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