一、While作为并列连词，意思为“而，然而”，表前后意义上的对比或转折。
你一直都在例如：There’s plenty of rain in the southeast,while there's little in the northeast.东南部雨量充足，而西北部则很少下雨。
Some people waste food while others haven't
enough.有些人浪费粮食，然而有些人却吃不饱。
二、另外while还有别的用法，while引导状语从句，有以下两种含义：
While I was playing the piano,she was dancing．我在弹钢琴，她在跳舞.
While Jim is picking apples,Kate is carrying apples to the
truck．吉姆正在摘苹果，凯特正在把苹果搬到卡车上去.
2．表示某个动作正在进行时，又发生了另一动作（该动作用一般过去时）.如：
While I was reading,I fell asleep．我读着读着就睡着了.
While we were swimming in the river,we saw a fish jump out of the
water．我们正在河中游泳时，看见一条鱼跃出了水面.
三、while还有以下几种常见用法：
1．只要（＝as long as）
There will be life while there is water and air．只要有空气和水，就会有生命.
2．而；然而〔表示对比〕
He is a driver while I'm a teacher．他是司机，而我是老师.
3．虽然（＝although）；尽管〔表示让步〕
While I see what you say,I can't agree with
you．虽然我能理解你说的话，但是我不能同意你.
4．用作名词，表示“一会儿或一段时间”，常与a,the或this等连用.如：
Just wait a while and then I will help you.等一下，我会来帮你的.
Where have you been all this while?这一阵子你一直都在哪儿?
四、while所引导的时间状语从句中的谓语动词只能是延续性动词。
例如：I met with an old friend of mine while(when) I was walking along the street.
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