while
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篇一:[while]while用法怎么用?
while:[ (h)wail ] While用法小结一、while作名词用,表示“一会儿”“一段时间”1.She likes to lie down for a while after lunch.她喜欢午饭后躺一会儿.2.Coming 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.二、While作连词(1)引导时间状语1.We must strike while the iron is hot.趁热打铁.2.While 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)1.While 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.2.While 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”1.While there is life there is hope.只要生命存在,就有希望.2.While there is a way there is away.有志者事竟成.三、While作并列连词用,意思为“而,然而”,表对比.而but表转折.注意用心比较体会while与but的句中用意1.Some people waste food while others haven"t enough.有些人很费粮食,然而有些人却吃不饱.2.The 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.4.Honey is sweet,but the bee stings.蜂蜜很甜,但蜜蜂有刺蜇人.四.while,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：be about to do…when…正要做…这时(发生另一事)句型B：was/were doing…when…正在…这时(发生另一事)句型C：had done…when…刚要做…这时(发生另一事)1.We were about to set out when it began to rain.我们刚要出发天突然下雨了.2.He had hardly sat down when his mobile rang.他刚一坐下手机就响了.3.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.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”.as则表示两个变化中的动作的同时性,译为“一边…一边…”.1.While 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)2.He hurried home,looking behind as he went.他匆匆回家,边走边往后看.
篇二:[while]while的语法
一、 while 用作名词时,意为“一段时间,一会儿”.例如：I stayed there for a short while.（我在那儿呆了一小会儿.） The postman came a short while ago.（邮递员刚刚来过.） 二、 while 用作连词时,有以下几种含义：1.意为“当……时候,和……同时”,引导时间状语从句.例如：While I was watching TV,the bell rang.（我看电视时,铃响了.） Meimei watched TV while she ate her supper.（梅梅边吃晚饭边看电视.） 2.意为“虽然,尽管”,引导让步状语从句.例如：While it was late,he went on working.（虽然很晚了,但他还在继续工作.） While he is in poor health,he works hard.（虽然他身体不好,但他还是努力工作.） 3.连接两个并列句子,表示“对比”关系.例如：He went out for a walk,while I stayed at home.（他出去散步了,而我却呆在家里.） I like singing while she likes dancing.（我喜欢唱歌,而她喜欢跳舞.） You like sports,while I prefer music.（你喜欢体育,而我更喜欢音乐.） 三、 while 引导状语从句时,应注意以下几点：1.while 引导的时间状语从句既可放在句首,也可放在句末；而 while 引导的让步状语从句一般放在句首,不放在句末.另外,也可以从意义上加以区分.例如：While he was tired,he went on working.（虽然他累了,但他还是继续工作.） （ while 引导让步状语从句） While he was tired,he would have a rest.（他累了就休息一会儿.） （ while 引导时间状语从句） 2.while 引导让步状语从句时,如果从句的主语和主句的主语相同,那么从句的主语和谓语动词 be 都可以省略.例如：While he was ill,he went there.（= While ill,he went there.） （虽然他有病,但他还是去那里了.） 3.while 和 when 都可以引导时间状语从句,但应注意：while 引导的时间状语从句中的谓语动词必须是延续性的动词；而 when 引导的时间状语从句中的谓语动词既可以是延续性动词,也可以是非延续性动词.当时间状语从句中的谓语动词是延续性动词时,while 和 when 可以互相替换.例如：While we were talking,the teacher came in.（我们正在谈话时,老师进来了.） The bus had left when we arrived at the bus stop.（当我们到达车站时,公共汽车已经开走了.） （ arrive 是非延续性动词,因此,此句中的 when 不能用 while 替换.） When / While we were having a meeting,our teacher came in.（我们正在开会时,老师走了进来.） （ have 是延续性动词,因此,句中的 when 可以用 while 替换.） 4.while 引导的状语从句还可以表示“某个动作正在进行的同时,另一个动作也在进行之中”.例如：While the teacher was speaking,the students were listening.
篇三:[while]While的用法及while与when的区别.
when,while这三个词都有"当……时候"之意,但用法有所不同,使用时要特别注意.①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续性动词.如：When I got home,he was having supper.我到家时,他正在吃饭.When I was young,I liked dancing.我年轻时喜欢跳舞.②while只指"时间段",不指"时间点",从句的动词只限于持续性动词.如：While I slept,a thief broke in.在我睡觉时,盗贼闯了进来.辨析 ①when从句与主句动作先后发生时,不能与while互换.如：When he has finished his work,he takes a short rest.每当他做完工作后,总要稍稍休息一下.(when = after) When I got to the cinema,the film had already begun.当我到电影院时,电影已经开始了.(when=before) ②when从句动词为终止性动词时,不能由while替换.如：When he came yesterday,we were playing basketball.昨天他来时,我们正在打篮球.③当从句的谓语是表动作的延续性动词时,when,while才有可能互相替代.如：While / When we were still laughing,the teacher came in.正当我们仍在大声嬉笑时,老师进来了.④当从句的谓语动词是终止性动词,而且主句的谓语动词也是终止性动词时,when可和as通用,而且用as比用when在时间上更为紧凑,有"正当这时"的含义.如：He came just as (or when) I reached the door.我刚到门那儿,他就来了.⑤从句的谓语动词如表示状态时,通常用while.如：We must strike while the iron is hot.我们应该趁热打铁.⑥while和when都可以用作并列连词.Mike is tall while his brother is short.迈克的个子很高,然而他弟弟很矮.Mary was on her way home when two big boys stopped her.玛丽正走在回家的路上,这时两个大个子男孩拦住她.
