英语的很多知识都是比较容易混淆的,如果掌握不好,对我们的成绩提高会有影响,所以我们应该重视这些知识的学习,通过总结区分这些知识的学习,这样我们的成绩才能提高。下面是学大的专家为大家总结的when与while的区别。
when与while的区别
①when是at or during the time that, 既指时间点,也可指一段时间;
while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。
②when 说明从句的动作和主句的动作可以是同时,也可以是先后发生;while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。
③由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如:
a. when the teacher came in, we were talking.
当此句改变主从句的位置时,则为:
while we were talking, the teacher came in.
b. they were singing while we were dancing.
④when和while 还可作并列连词。when表示“在那时”;while表示“而,却”,表对照关系。如:
a. the children were running to move the bag of rice when they heard the sound of a motor bike.
孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音。
b. he is strong while his brother is weak.
他长得很结实,而他弟弟却很瘦弱。
when; while 当……时候
while能用when代替; 但是when却不一定能用while代替.
while+从句, 动作一定会延续
when+延续性动词/瞬间动词; when he arrived
when he died
when,while强调动作同时发生
过去进行时 :
在过去的某一点时间, 或者是过去某一动作同时发生的另外一个动作
瞬间动词(arrive)无进行时态
i am arriving 进行时态表示将要
when he arrived,i was having dinner.
同时发生的两个动作, 均用过去进行时
when i was doing my homework,my mother was cooking.
when my mother was doing the housework,my father was watching tv.
同时发生的两个动作
1.一个用一般过去时, 另一个用过去进行时
2.分工的情况, 均用过去进行时
when the plane arrived,...were waiting inside the main building
while others were waiting on...
while...
...were keeping guard at the door,two others opened the parcel.
表面上是分工, 两个动作同时发生, 不是同时开始同时结束, 延续时间不一致,
长一点时间的动作用进行时态, 短时间的动作用过去时.
when someone knocked at the door,i was having dinner.
when和while引导的时间状语从句与这一时态连用。所以区别when和while的用法成了这一单元的难点。 (一)、when,while都有“当……时候”的意思。when既可表示某一点时间,也可以表示某一段时间 。在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生。 例如: 1、i was just reading a book when she came into my room. 她走进我房间时,我正在看书。 2、were you writing when the teacher came in? 老师进来的时候,你在写信吗? 3、when he was a child he was always trying out new ideas. 他小时候就常常试验一些新的设想。 (二)、while只能表示某一段时间,不能表示某一点时间。在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在。 例如: 1、while jim was mending his bike, lin tao came to see him. 正当吉姆修自行车时,林涛来看他。 2、you can’t do your homework while you’re watching tv. 你不能一边看电视一边做家庭作业。 (三)、另外,when和while的区别还在于:while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态。 例如: 1、while they were talking , the bell rang. 正在他们谈话的时候,上课铃响了。 2、i was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈回家的时候,我正在做家庭作业。
when/while都可做并列连词.前者表and at that time,(这时,突然),后者表对比,可译为”然而”
i was going downstairs when the telephone rang.
lucy is in blue while lily is in green.
when后加瞬间动词 while后也可加持续性动词
while 有转折之意 类似于但是 同时while也可以连接两个进行时的句子 例如:he is listening to music while she is cleaning the windows.这里的while就相当于and,表示两个动作同时发生。
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。
同学们掌握了when与while的区别知识点,在平时的学习中,我们就应该关注这些重要的易错考察点,然后通过习题进行练习,这样在考试中才能考取好成绩。