while,一段时间

下面是小编为大家整理的while,一段时间,供大家参考。

　

　while 一段时间； 当……时（和……同时）

　； 却

　（1 ）

　I”ll be back for a while

　（2）

　He fell asleep while doing homework.

　（3）

　John was dressed in brown while Mary was dressed in blue

　 连词 while 大致有以下四种用法:

　1 .引导时间状语从句,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 supper.玛丽边吃饭边看电视。

　 While she was listening to the radio, she fell asleep.她听着收音机睡着了。

　 while 引导从句时,如主从句的主语一致,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 students.我们边当老师边当学生。

　 While (he was) yet a youth, he gained many prizes.他年轻时就曾多次获奖。

　 He caught a cold while(he was) on vacation.他度假时患了感冒。

　 2.表示对比或转折,意为"而;然而"。

　此时,while 一般位于句中。

　如:

　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。

　 You like sports, while I prefer music.你喜欢体育,而我更喜欢音乐。

　 3.表示让步,通常位于句首,意为"尽管;虽然"。

　如:

　While I agree with your reasons, I can"t allow it.尽管我同意你的理由,但我不能允许这样做。

　 While he loves his students, he is very strict with them.虽然他爱他的学生,可是他对学生们很严格。

　While (he was) respected, he is not liked.他虽受人尊敬,但并不被人喜欢。

　 4.表示条件,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 here.只要我们在,你就别着急。

　 There will be life while there is water and air.只要有空气和水,就有生命。

　 While there is life, there is hope.留得生命在,不怕没希望。

　 5.意为"同时;也"。

　如:

　While the book is welcomed by schol-

　ars, it will make an immediate appeal to the general readers.这本书受到学者的欢迎,同时也会引起一般读者的兴趣。

　 6.意为"趁着"。

　如:

　Make hay while the sun shines.晒草要趁阳光好。

　(谚)

　Strike while the iron is hot.趁热打铁。

　(谚)

　While the roses are yet in bloom,

　will you come with me to see them?趁着玫瑰花还开着, 你和我一道去看看好吗

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