while一词的用法.doc

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While一词的用法
连词while大致有以下四种用法:
,意为"当……的时候;和……同时",此时的主从句谓语动作同时发生,从句谓语通常是延续性动词。如:
Mary watched TV while she ate her 。
While she was listening to the radio, she fell 。
while引导从句时,如果主从句的主语一致,且从句谓语又含有be,则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。如:
We are teachers while (we are) serving as 。
While (he was) yet a youth, he gained many 。
He caught a cold while(he was) on 。
,意为"而;然而"。此时,while一般位于句中。如:
Some people waste food while others haven't ,然而有些人却吃不饱。
You like sports, while I prefer ,而我更喜欢音乐。
,通常位于句首, 意为"尽管;虽然"。如:
While I agree with your reasons, I can't allow ,但我不能允许这样做。
While he loves his students, he is very strict with ,可是他对学生们很严格。
While (he was) respected, he is not ,但并不被人喜欢。
, 意为"只要",其意思和用法相当于as long as。while可位于句首,也可位于句中。如:
You don't have to worry while we are ,你就别着急。