while的用法是什么
while的用法四种句型及意思如下：
while用法1：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。
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。
while用法2：另外while还有别的用法，while引导状语从句有以下两种含义：
1、表示某个动作正在进行的同时，另一动作也在进行之中，这时主从句都用进行时态，有对同类的两个动作进行对比的意味。
如：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。
while用法3：
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？
while用法4：
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。
我在街上散步时遇到了我的一位老朋友。
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