while 的用法.doc

优质解答一、 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 speakin