一、考查表示时间的用法，其意为“当……的时候”。
如：We must strike while the iron is hot.
我们要趁热打铁。
Stand still while I take your photograph.
我给你拍照时站着不要动。
Have we got enough books to read while we are on holiday?
假期里我们有足够的书看吗?
Were there any calls for me while I was out?
我出去的时候，有人来过电话吗?
She hates anyone listening while she is telephoning.
她打电话时不愿让任何人听。
二、考查表示让步的用法，其意为“尽管”“虽然”。
如：
While the work was difficult, it was interesting.
虽然工作有难度，但很有趣。
While I understand what you say, I can’t agree with you.
虽然我理解你的意思，但我还是不同意。
While the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
虽然因特网很有帮助，但我还是认为在其上花太多的时间不是个好主意。
While we don’t agree we continue to be friends.
尽管我们意见不同，我们还是朋友。
While I did well in class, I was a poor performer at games.
虽说我学习不错，我运动却不行。
While a few became richer, many did not.
虽然一些人变得更富有了，但多数人并非如此。
三、考查表示对比的用法，其意为“而”“但”。
如：
In some places women are expected to earn money while men work at home and raise their children.
有些地方妇女挣钱，而男子则在家里持家和带孩子。
Air is a fluid but not a liquid, while water is both a fluid and a liquid.
空气是流体不是液体，水是流体也是液体。
Some people waste food while others haven’t enough.
一些人糟踏食物而另一些人却食不果腹。
I went swimming while the others played tennis.
我去游泳，而其余的人则去打网球了。
Prices are rising sharply, while incomes are lagging far behind.
物价飞涨而收入却远远落后。
四、考查其省略用法，即主句与从句主语相同，且从句谓语动词含有动词be时，通常可省略从句主语和动词be。
如：
While (he was) in prison, she wrote her first novel.
He had strayed from home while still a boy.
他小时候就离开家到处流浪了。