有关while的几种用法
While这个是英语学习中经常会遇到的，相信大家应该都不陌生，那么你清楚它的用法吗？下面本站小编为大家总结while的几种常见的用法，欢迎大家一起学习。
but表转折.注意用心比较体会while与but的句中用意
people waste food while others haven't enough.
有些人很费粮食,然而有些人却吃不饱.
son was having a good meal at home,while the parents were working in the fields.
儿子在家吃好饭而父母却在田里辛勤劳作.
3.I ought to have helped her,but I never could.
我本该帮她但没能.
y is sweet,but the bee stings.
蜂蜜很甜,但蜜蜂有刺蜇人.
while的用法：作连词，引导时间状语must strike while the iron is hot.趁热打铁.
e she was listening to the radio,she fell asleep.
她听着收音机睡着了.
(2)引起让步状语从句,意思是“虽然…但是….”、“尽管…但是…”(多放于句首)e he loves his students,he is very strict with them..
虽然他爱他的学生,可是他对他们很严格.
e these experiments are interesting and useful,it is important to remember that they may not always tell us much.(BookIIIp125)
虽然这些实验很有趣也有用,但是很重要的是要记住,这些实验也可能不会告诉你很多.
(3)引起条件状语,意思是“只要”
e there is life there is hope.只要生命存在,就有希望.
e there is a way there is away.有志者事竟成.
while的用法：作名词用，表示“一会儿”“一段时间”likes to lie down for a while after lunch.
她喜欢午饭后躺一会儿.
ng to another country to study requires a big adjustment and it takes a while to fit in.
来到另一个国家求学,需要花一段时间来适应.
四e,when,as的用法区别
都译为“当…的时候”,区别为：when后的从句谓语动词既可是延续性动词,也可是短暂性动词,而且还可作并列连词,译为“这时”.但以下句型一定用when,作并列连词：
句型A：was/were doing…when…正在…这时(发生另一事)
句型B：be about to do…when…正要做…这时(发生另一事)
句型C：had done…when…刚要做…这时(发生另一事)
were about to set out when it began to rain.
我们刚要出发天突然下雨了.
2.I was walking along the bank of the river when I fell into it.
我正沿河岸散步突然掉进水里.
had hardly sat down when his mobile rang.
他刚一坐下手机就响了.
while后的从句谓语动词只能是延续性动词,强调主从句的两个动词同时发生;while也可作并列连词,表示两个动作的对比,译为“而”“然而”则表示两个变化中的动作的同时性,译为“一边…一边…”.
e his mother was cooking in the kitchen,the boy fell asleep in the chair.
(在一个延续动作过程中发生另一个动作)
hurried home,looking behind as he went.
他匆匆回家,边走边往后看.
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