一、while意为"当.时候",指一段时间,不能用来表示一个时间点.
While the discussion was still going on,George came in.当讨论还在进行时,乔治走了进来.
二、while意为"而;然而",表示转折.
There're 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.
三、while意为"虽然;尽管",表示让步.
While I admit his good points,I can see his shortcomings.尽管我承认他的优点,但我还是能看到他的缺点.
四、while意为"只要",表示条件.
We can surely overcome these difficulties while we are closely united.只要我们紧密地团结一致,一定能克服这些困难.
五、while从句中的省略.
当while从句中的主语与主句的主语一致,且含有be的某种形式时,从句中的主语连同be可同时省略.
While listening to the radio,she fell asleep.她在听收音机时睡着了.
While in London,he studied music and painting.在伦敦时,他学习音乐和绘画.
六、while可用作名词,意为"一会儿;一段时间".
作名词用时,主要用于短语中:after a while "过了一会儿"; all the while "一直,始终"; a short / little while ago "刚才"; once in a while "偶尔,间或"; wait / rest(for) a while "等 / 休息一会儿".
I haven't seen her for a long while.我好久没有看见她了.
