when和while的区别
when和while的区别
when和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。
Why do you want a new job when you've got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的?Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。
Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。
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。
when 与while的区别
when 与while的区别1. when指某个时间点,表示瞬间动作;while 指某个时间段,表示延续性动作。
如:用when引导的状语从句表示时间,说明一个动作发生的时候,另一个动作正在进行。
如:—What were you doing when I came into the classroom? 当我走进教室的时候你正在干什么?—I was reading. 我正在读书。
—What was he doing when I came in? 当我进来的时候他正在干什么?— He was watching TV.他正在看电视。
When I got there, she was playing the violin. 我到那里时,她正在拉小提琴。
用when引导的时间状语从句也可以表示某一个动作已发生,另一个动作已经完成,已经完成的主句的动作用过去完成时态来体现。
When they arrived at the station, the train had left.当他们到达车站的时候,火车已经离开了。
用while连接的时间状语从句一般用过去进行时,表示正在进行某一个动作时发生了另一个动作,而主句常用一般过去时。
While I was playing the violin, he came to see me.我正在拉小提琴时,他来看我了。
While he was reading, the telephone rang. 当他正在读书的时候,电话铃响了。
While we were boating on the lake, we saw a fish jump out of the water.当我们正在湖中划船时,我们看见了一条鱼跳出了水面。
注意:英语中,延续性动作是由延续性动词发出的,瞬间性动作是由非延续性动词发出的。
延续性动词和非延续性动词的区别:延续性动词是指该动作可以延续一段时间,而不是瞬间结束,如work(工作)、study(学习)、eat(吃)、watch(观看);非延续性动词是指该动作极为短暂,瞬间便会结束,如start(开始)、begin(开始)、hit(撞)、see(看见)、knock(敲)、jump(跳)。
When和While的区别
When和While的区别通常when 后面接一般过去时while 后面接过去进行时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。
when和while的区别
when和while的区别when 当什么时可表瞬间事情可同时或者先后发生例子it was snowing when we got to the airport 我们到机场时天在下雪(先后顺序)while 用于相伴发生的同时进行例子some students were reading while others were writing有些学生在读书有些在写.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。
中考英语when和while的用法和区别
中考英语when和while的用法和区别when和while的区别一:when 当......之时(时间点),后接短暂性瞬间动词when在.....期间(时间段),后接延续性动词while在......期间(时间段),后接延续性动词因此,when可后接短暂性或延续性动词,而while只能接延续性动词。
后接短暂性终止性瞬间动词时,常用when,不用while;后接延续性动词时,when和while 常可替换使用;I was reading when you came in.当你进来的时候,我正在看书。
came是短暂性动词,此处when不能用while代替You came in while I was reading.= You came in when I was reading.read是延续性动词,此处when可用while代替when和while的区别二:1.表示正在做某事的期间,发生了意料之外的另一个短暂的动作,要对比这两件事,常用:主句(过去进行时-持续性动词),when从句(一般过去时-短暂性动词)We were playing games happily when we heard a cry.我们正在高兴地玩游戏的时候,(突然)听见了一声大叫。
2.若主句和从句的动作都比较长,表示同时发生,更常用while,此时可用进行时态或一般时态He waited in the car while l was in the shop.当我在店里的时候,他在车里等着。
He was watching TV while I was writing.当我在写作的时候,他正在看电视。
when和while的区别三:1.when可表示表示某个动作发生结束后紧接发生另一个动作,而while则不可When the bell rang, John went out of the classroom.铃声响后,约翰走出教室。
when_和_while的区别
时态
• when和while的区别还在于: when引导的时间状语从句多用一般时态,
而while引导的时间状语从句多用进行时态。
例句: 1、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。
3. ___Jake was waiting at the door, an old woman called to him.
A.While B.And
C.When
D.After
4. ______ Mary was talking on the phone,her sister walked in.
(sweep)the floor when I
(leave)
home. was sweeping
left
7.I
(read) a history book when someone
(knock) at the door.
was reading
knock
6. until引导的时间状语从句 until表示动作或状态一直持续到某一 时刻, 即“直到……”。
_s_i_n_c_e__ he started to learn English last month.
单项选择
• 1.Paul is listening to music__he is playing computer games.A.after B.before C.that D.while
• 2.We didn’t start the work__our teacher came back.A.if B.while C.until D.as soon as
When和While的区别
When和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(说明:表示时间段,从句用进行时;表示时间点时,从句用一般过去式或一般现在时。
如:1)While / When I was having supper at six last night, someone knocked at the door(敲门)2) When you leave the room, please turn off the lights.);而while从句中的动词必须是延续性动词。
②when 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;而while引导的时间状语从句用过去进行时, 主句用一般过去时;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:1) . 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.2). They were singing while we were dancing..3) Tom was waiting for a bus while he was reading a newspaper ta this time yesterdar.‘as, when, while的区别as, when, while都表示主、从句的动作或状态同时发生,但三者意义不尽相同。
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 arrivedwhen he diedwhen,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 buildingwhile 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。
when和while的区别
while和when的区别一、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。
when和while的区别
when和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。
具体你可以参考这一段。
when,while,as引导时间状语从句的区别when,while,as显然都可以引导时间状语从句,但用法区别非常大。
一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。
① Why do you want a new job when youve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的?②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。
(最新整理)when和while的区别
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When和while的区别一。
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。
when和while的区别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。
初中英语when和while的区别 知识精讲
初中英语when和while的区别知识精讲(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。
1)、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:2)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和while的区别和用法
(一)when和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)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。
while和when的区别
While和when的区别两者的区别如下: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 arrivedwhen he diedwhen,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 buildingwhile 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。
when 和while的用法区别
when 和while的用法区别when和while是英语中两个常见的连词,它们在句子中的使用有一些区别。
下面就来详细介绍一下它们的用法区别。
一、时间状语从句中的用法:1. when:表示“当……的时候”,引导的时间状语从句中的动作与主句的动作同时或几乎同时发生。
例句:I always feel sleepy when I listen to classical music.(当我听古典音乐的时候,我总是感到困倦。
)2. while:表示“在……的时候”,引导的时间状语从句中的动作与主句的动作同时发生,但强调主句的动作持续时间较长。
例句:She watched a movie while her brother was studying. (她在她哥哥学习的时候看电影。
)二、连词的不同含义:1. when:除了表示时间状语从句外,还可以表示“当……的时候”、“每当”等含义。
例句:When it rains, I always stay at home.(每当下雨,我总是待在家里。
)2. while:除了表示时间状语从句外,还可以表示对比、让步、转折等含义。
例句:While I appreciate your effort, I still think you need to improve.(虽然我赞赏你的努力,但我仍然认为你需要进步。
)三、连词引导的句子结构:1. when:可以引导的从句有主语+谓语或名词性从句。
例句:When she arrived, everyone applauded.(当她到达时,大家鼓掌。
)例句:I don't know when he will come back.(我不知道他何时会回来。
)2. while:除了可以引导主语+谓语的从句外,还可以引导状语从句和让步从句。
例句:While I was reading, the phone rang.(我在看书的时候,电话响了。
When 与 while 的区别
When 与 while 的区别 When 的意思有(1)当……时 (2)就在那时;忽然间。
When 可以引导时间状语从句, 也可以引导宾语从句 。
While 意思为: (1)(正)当……时, (2)一会儿 (3)而,却 (4)一边……一边….. 例如:1、when I got to the station ,the train had already left .(当……时 ) 2. I was walking in the park when I heard some call me (.就在那时) 3.I was falling asleep when I someone knocked at the door .(忽然) 4.while I was readying ,he came in 。
5.Can you wait for a while ?(一会儿) 6.I was readying while I was listening to music 。
(一边……一边) When 与 while 引导时间状语从句的区别: When 引导的从句其后动词即可以是延续性动词也可以是非延续性动词, 可延续性动词常用 进行时,非延续性动词用一般过去时。
例如: When we were readying,he came in (也可用 while)或者 We were readying when he came in。
When I got home,my mother was cooking 。
(不能用 while) While 引导的从句常用进行时,不跟非延续性动词。
例如: 上句中的 when I got home when 不能 换作 while ,再有,when I arrived at school 等均不能 用 while. 练习: 一、改错 1.He is fat but I am thin. 2.It was raining while I arrived. 3.While did you come here ? 4.while we got to school ,it was snowing. 5. he thinks about it for a when. 二、单项选择: ,in fact ,I was scolding him for his bad 1.She thought I was praising her child, behaviors at school. A. what B . while C .so that D therefore 2. I do every single bit of housework my husband Bob just do the dishes now and then. A. while B. since C when D as 3. We were swimming in the lake suddenly the storm started. A while B . until C. when D before 4.I was just falling asleep the telephone bell rang. A. after B. before C . when D while Any 与 any other 的区别 Any 用于否定句或疑问句意思为:一些;any other 用于否定句或疑问句意思为:其他 一些例如:Do you have any books ?Have you got any other colors ? 但是,在肯定句中 any 意思为:任何的,其后跟单数名词,any other 意思为:其他任 何一个,其后也跟单数名词,即: any +单数名词,any other +单数名词。
when和while的区别
三〕、另外,when和while的区分还在于:while 引导的时间状语从句多用进展时态,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
〔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 语动词只能是连续性的,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. 正值吉姆修自行车时,林涛来看他。 2、You can’t do your homework while
room. 她走进我房间时,我正在看书。 2、Were you writing when the teacher came in?
教师进来的时候,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。
正在看电视。 I was watching TV when Peter came in. 当Peter进来时我正在看
电视。
2) as 和 when 可与非连续性动词连用,而 while 只能与连续性动 词连用。
例如:He came in when/ as I was going to bed.我刚要上床睡觉, 他进来了。
mother came back home yesterday evening. 昨天晚上妈妈回家的时候,我正在做家庭作
when和 while的区别
when和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。
具体你可以参考这一段。
when,while,as引导时间状语从句的区别when,while,as显然都可以引导时间状语从句,但用法区别非常大。
一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as 只能和延续性动词连用。
①Why do you want a new job when youve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的?②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。
when与while的区别
when与while的区别表示“当....的时候”的意思时,可以替换。
when 和while的用法区别两者的区别如下:①when是at or during the time that, 既指时间点,也可指一段时间;(指时间)while是during the time that,只指一段时间,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(指动词)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;(指动作)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。
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。
先看下面一道高考题:—I'm going to the post office.—________you're there, can you get me some stamps?A. AsB. WhileC. BecauseD. If对连词的用法考查在每年高考题中均有涉及。
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when与while的用法与区别(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,我正在做家庭作注意:1) 如主句谓语动词表示的是短暂动作,从句时间状语指一段时间,when while as 三者可通用。
例如:Peter came in while /as I was watching TV.当Peter进来的时候我正在看电视。
I was watching TV when Peter came in. 当Peter进来时我正在看电视。
2) as 和when 可与非延续性动词连用,而while 只能与延续性动词连用。
例如:He came in when/ as I was going to bed.我正要上床睡觉,他进来了。
3) as 和while可用来指一段时间,但as 强调主句与从句表示的动作同时发生,while强调主句表示的动作是在while 从句的动作延续中发生。
例如:As my mother sang those old songs, tears ran down her cheeks.当我妈妈唱起那些老歌时,眼泪顺着她的脸颊流了下来。
I came in while he was reading an interesting book in his room.when和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。
具体你可以参考这一段。
when,while,as引导时间状语从句的区别when,while,as显然都可以引导时间状语从句,但用法区别非常大。
一、when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用。
①Why do you want a new job when youve got such a good one already?(get为短暂性动词)你已经找到如此好的工作,为何还想再找新的?②Sorry,I was out when you called me.(call为短暂性动词)对不起,你打电话时我刚好外出了。
③Strike while the iron is hot.(is为延续性动词,表示一种持续的状态)趁热打铁。
④The students took notes as they listened.(listen为延续性动词)学生们边听课边做笔记。
二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。
1.从句动作在主句动作前发生,只用when。
①When he had finished his homework,he took a short rest.(finished先发生)当他完成作业后,他休息了一会儿。
②When I got to the airport,the guests had left.(got to后发生)当我赶到飞机场时,客人们已经离开了。
2.从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用。
①When /While /As we were dancing,a stranger came in.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来。
②When /While /As she was making a phonecall,I was writing a letter.(make为延续性动词)当她在打电话时,我正在写信。
3.当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用as。
这时,as常表示“随着……”;“一边……,一边……”之意。
①As the time went on,the weather got worse.(as表示“随着……”之意)②The atmosphere gets thinner and thinner as the height increases.随着高度的增加,大气越来越稀薄。
③As years go by,China is getting stronger and richer.随着时间一年一年过去,中国变得越来越富强了。
④The little girls sang as they went.小姑娘们一边走,一边唱。
⑤The sad mother sat on the roadside,shouting as she was crying.伤心的妈妈坐在路边,边哭边叫。
4.在将来时从句中,常用when,且从句须用一般时代替将来时。
①You shall borrow the book when I have finished reading it.在我读完这本书后,你可以借阅。
②When the manager comes here for a visit next week,Ill talk with him about this.下周,经理来这参观时,我会和他谈谈此事。
三、when用于表示“一……就……”的句型中(指过去的事情)。
sb.had hardly(=scarcely)done sth.when...=Hardly /Scarcely had sb.done sth.when...①I had hardly /scarcely closed my eyes when someone knocked at the door.=Hardly /Scarcely had I closed my eyes when someone knocked at the door.我刚一闭上眼,就有人在敲门了。
②I had hardly /scarcely entered my room when the telephone rang.=Hardly /Scarcely had I entered my room when the telephone rang.我刚一走进房门,电话就响了。
when, while, as区别详解一、根据从句动作的持续性来区分1. “主短从长”型:即主句是一个短暂性的动作,而从句是一个持续性动作,此时三者都可用。
如:Jim hurt his arm while [when, as] he was playing tennis.吉姆打网球时把手臂扭了。
As [When, While] she was waiting for the train, she became very impatient.她在等火车时,变得很不耐烦。
注意:as用于引出一个持续性动词表示“在……期间”时,其谓语通常只能是那些含有动作(action)和发展(development)意味的动词,一般不能是那些不用于进行时态的动词(如be, seem, love, want, agree, see, know, have等),所以下面一句中的while 不能换为as:A:I'm going to the post office.我要去邮局。
B:While you are there, can you get me some stamps?当你在邮局时,能帮我买几张邮票吗?2. “主长从长”型:即主句和从句为两个同时进行的动作或存在的状态,且强调主句动作或状态延续到从句所指的整个时间,此时通常要用while。