while的三个用法 while的用法总结

howr和while用法一样吗？

①The atmosphere gets thinner and thinner as the height increases．

1、Howr和whereas的用法不同

while的三个用法 while的用法总结

while的三个用法 while的用法总结

在句首使用howr（后面要加逗号）来表示和前一句意思相反。Whereas用于同一句内的两个相反意见（前面要加逗号）。

如：Howr short life might be, it was necessary to sustain it.无论生命多么短促，坚持到底总是必要的。

扩展资料

but 与 howr的用法区别：

1、表示转折时，but 是连词。

如：He is youna. When the teacher came in, we were talking.g but very experienced. 他虽年轻，但经验很丰富。

He has three daughters but no sons. 他有3 个女儿，但没有儿子。

2、howr 表示“然while用于延续性。而”、“可是”时，有的词书认为它是连词，有的词书认为它是副词。

之所以将其视为副词，也许是因为像许多副词一样不仅能位于句首，而且能位于句中(注意前后使用逗号)，甚至句末(注意其前也用逗号)。

如：Later, howr, he changed his mind. 可是他后来改变了主意。

He hasn’t arrived. He may, howr, come later. 他还没有到，不过他等会儿可能会来。

3、当连接两个句子时，其前通常应用分号，或另起新句。

如：It’s raining hard; howr, I think we should go out. / It’s raining hard. Howr, I think we should go out. 雨下得很大，但我想我们还得出去。

while during when 的用法分别是怎样的 ， 这三个单词之间又有什么区别呢.

4、在使用While时，需要注意主从句的时态。主从句的时态必须是一致的，不能一个是现在时，另一个是过去时。如果时态不一致，应该使用相应的时态转换形式，如过去进行时、将来进行时等。

when 和while的用法区别

while是during the time that，只指一段时间，因此when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。

当此句改变主从句的位置时，则为：

While we were talking, the teacher came in.

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 r 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时间状语从句的区别

when，while，as显然都可以时间状语从句，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。

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。

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When I was young, I liked dancing.我年轻时喜欢跳舞。场时，客人们已经离开了。

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 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。

① As the time went o3．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。n，the weather got worse．（as表示“随着……”之意）

② The 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，变得越来越富强了。

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 he finished reading it．在我读完这本书后，你可以借阅。

②When the mar comes here for a visit next week，Ill talk with him about this．下周，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）。

．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had ．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 ephone rang．＝Hardly ／Scarcely had I entered my room when the ephone rang．我刚一走进房门，电话就响了。

while后的句子用什么时态?

一、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。 while 用作名词时，意为“一段时间同when一样有“当。。。。时”但while 还有转折的意思，一会儿”。例如：

while during when 的用法分别是怎样的 ， 这三个单词之间又有什么区别呢.

1、动词：While doing soming, some④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记。thing else(虽然) (happened)。

when 和while的用法区别 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，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 r 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时间状语从句的区别 when，while，as显然都可以时间状语从句，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。 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。 ④ The 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 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。 ① As the time went on，the weather got worse．（as表示“随着……”之意） ② The 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，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 he finished reading it．在我读完这本书后，你可以借阅。 ②When the mar comes here for a visit next week，Ill talk with him about this．下周，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）。 ．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had ．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 ephone rang．＝Hardly ／Scarcely had I entered my room when the ephone rang．我刚一走进房门，电话就响了。

whereas和while的区别

时间状语从句之前，可以使用when, while, as。但是很多同学不知道应该使用哪个来时间状语从句，今天百校就跟同学们分享when，while，as时间状语从句的区别。

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。

对不起，你打电话时我刚好外出了。

②Strike while the iron is hot．（is为延续性动词，表示一种持续的状态）

趁①when是at or during the time that, 既指时间点，也可指一段时间；热打铁。

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 w3. 若从句是一个短暂性动作，主句是一个持续性动作，可用 as / when 但不用 while：hen。

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。

当她在打电话时，我正在写信。

随着高度的增加，大气越来越稀薄。

4．在将来时从句中，常用when，且从句须用一般时代替将来时。

在我读完这本书后，你可以借阅。

三、when用于表示“一……就……”的句型中（指过去的事情）。

①I had hardly ／scarcely closed my eyes when someone knocked at the door．

＝Hardly ／ S①when意为"在……时刻或时期"，它可兼指"时间点"与"时间段"，所的从句的动词既可以是终止性动词，也可是持续性动词。如：carcely had I closed my eye

区别：

He is ill whereas I'm OK.

2）while一般用于普通口语，是一种非正式口语，表对比的意思，其强调的是动作过程的概念。

It's red on the top of the house while it's green underneath .

while的使用用法大汇总

= While (the boy was) beaten by his father,the boy

我们在学习英语的时候常常会碰到的英语单词，那就是while 了，那么大家知道while 的用有哪些呢?你学完了吗?下面，我在这给大家带来while的使用用法大汇总，欢迎大家借鉴参考!

(但是)

连词“while”具有两种意义，因此为了避免误用，使用时需多加注意。

“while”作为连词来使用的时候，表示“同时性”或“对比性、对立”。根据文章的内容可明确该词具体表达了哪一种意义的情况固然存在，但如同下文中所展示的相反情况同样存在。

The temperature decreased while the growth rate increased.

这句话可产生“温度下降的同时生长速度加快了”和“与温度下降所不同的是，生长速度却加快了”两种翻译。

正解是：若要使后者的翻译成立，“decreased”和“while”之间的逗号必不可少，因此目前的情况下无法直接确定此句的翻译。

while 的用法公开

1Most archaeological sites he been located by means of careful searching, while many others he been discovered by accident.

(然而)

2.While traditional “paid” media—such as evision commercials and print aertisements—still play a major role, companies today can exploit many alternative forms of media.

3.while we may be able to sustain the illusion of control through the conscious mind alone, in reality we are continually faced with a question: “Why cannot I make myself do this or achi that? ”

4.More recently, while examining housing construction, the researchers discovered that illiterate, non-English- speaking Mexican workers in Houston, Texas, consistently met best-pract labor productivity standards despite the complexity of the building industry's work.

(当)

5.While it is easy to ignore in our contact with them the effect of our acts upon their disition, it is not so easy as in dealing with s.

6.While still catching-up to men in some spheres of modern life, women appear to be way ahead in at least one undesirable category.

7.While Washington and Jefferson privay expressed distaste for slery, they also understood that it was part of the political and economic bedrock of the country they ed to create.

8.On the other hand, he did not accept as well founded the charge made by some of his critics that,/while he was a good observer, he had no power of reasoning.

(虽然)(这是在宾语从句的开头)

他们应该表现出强烈的兴趣和尊重他们初出的(看起来可能是幼稚或考虑不周详)的任何利益，同时成为探索未来选择的伙伴。

10.While the quality of legal journali varies greatly, there is 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：an undue reliance amongst many journalists on interpretations supplied to them by lawyers.

10.While comment and reaction from lawyers may enhance stories, it is preferable for journalists to rely on their own notions of significance and make their own judgments.

虽然

11.I he excluded him because, while his accomplishments may contribute to the solution of moral problems, he has not been charged with the task of approaching any but the factual aspects of those problems.

(虽然)(这是状语从句的开头)

12.Now researchers suspect that dreams are part of the mind’s emotional thermostat, regulating moods while the brain is “off-line.”

(当)

13.But not all parts of the brain are equally involved; the limbic (the “emotional brain”) is especially active, while the prefrontal cortex (the center of inlect and reasoning) is relatively quiet.(然而)

14.While n the modestly educated sought an elevated tone when they put pen to before the 1960s, n the most well regarded writing since then has sought to capture spoken English on the page.(虽然)

15.Russians he a deep love for their own language and carry large cks of memorized poetry in their heads, while Italian politicians tend to elaborate speech that would seem old-fashioned to most English-speakers.(然而)

16.One Italian example would be the Berlusconi group, while abroad Maxwell and Murdoch come to mind.(然而)

17.Ince seeks to grasp, manipulate, re-order, and adjust, while inlect examines, ponders, wonders, theorizes, criticizes and imagines.(然而)

18.As a nation, we may be overfunding the quest for unlikely cures while underfunding research on humbler therapies that could improve people’s lives.(然而)

19.“While we know how to l a robot to handle a specific error,” says De Lery, mar of a robotics program at NASA, “we can’t yet give a robot enough ‘common sense’ to reliably interact with a dynamic world.” (虽然)

20.The TSA cannot continue diverting resources into underused PreCheck lanes while most of the treling public suffers in unnecessary lines. (但是)

21.The authors of the United States Constitution attempted to establish an effective national government while preserving ________ for the states and liberty for individuals.

[A] autonomy (正确)

[B] dignity

[C] monopoly

[D] stability

21.While in America the trend started as a reaction to the economic decline -- after the mass redundancies caused by downsizing in the late ’80s -- and is still linked to the politics of thrift, in Britain, at least among the middle-class downshifters of my acquaintance, we he different reasons for seeking to simplify our lives.(虽然)

22.In 1995 the United States can look back on five years of solid growth while Japan has been struggling.(然而)

24.While warnings are often appropriate and necessary -- the ers of drug interactions, for example -- and many are required by state or federal regulations, it isn’t clear that they actually protect the manufacturers and sellers from liability if a customer is injured.

In May, Julie Nimmons, president of Schutt Sports in Illinois, successfully fought a lawsuit involving a football player who was paralyzed in a while wearing a Schutt helmet. (虽然)

while表转折的用法

①You shall borrow the book when I he finished reading it．

当while表转折时，意为“尽管，虽然”。与although或though类1）whereas是一种正式口语，强调的是转折意义：似，while用于引出一个相对情况的内容，强调其他东西并不会有所影响。

while在这种表转折的用法中，一般用于句首，并后接一个完整的句子。此外，while引出的内容通常有一定的对比或矛盾，以凸显其转折效果。

例句：

While John is a great musician, he doesn't he much experience performing live.虽然约翰是一位伟大的音乐家，但他没有太多的现场表演经验。

除此之外，while还有以下几个意思：

conj.虽然；在…期间；当…的时候；与…同时；(对比两件事物)…而，…然而；到…时；

n.一段时间；一会儿；

v.消磨；轻松地度过；

prep.直至(某时)。

除此之外，while还有以下几个用法：

意为“当……时候”,指一段时间，不能用来表示一个时间点。 例句：It is necessary to take a back-pack while hiking.

意为“虽然“；尽管”,表示让She sang as she went along. 她边走边唱。步。

例句：While I admit his good points, I can see his shortcomings.

例句：We can surely overcome these difficulties while we are closely united.

while和while的用法有什么不同吗？

意为“只要”,表示条件。

附上while的详细用法：

while:[ (h)wail ]

While用法小结

1.Shelikestoliedownforawhileafterlunch.

她喜欢午饭后躺一会儿.

2.Comingtoanothercountrytostudyrequiresabigadjustmentandittakesawhiletofitin.

来到另一个求学,需要花一段时间来适应.

二、While作连词(1)时间状语

1.Wemuststrikewhileironishot.趁热打铁.

2.Whileshewaslisteningtotheradio,shefellasleep.

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.Whileheloveshisstudents,heisverystrictwiththem..

虽然他爱他的学生,可是他对他们很严格.

2.Whileseexperimentsareinterestinganduseful,itisimportanttorememberthattheymaynotalwaysluuch.(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.He went out for a walk， while I stayed at home.

(3)引起条件状语,意思是“只要”

1.Whilereislifereishope.只要生命存在,就有希望.

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.Somepeoplewastefoodwhileothershen'tenough.

2.Thesonwashingagoodmealathome,whileparentswereworkinginthefields.

儿子在家吃好饭而父母却在田里辛勤劳作.

我本该帮她但没能.

4.Honeyissweet,butthebeestings.

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：beabouttodo…when…正要做…这时(发生另一事)

句型B：was/weredoing…when…正在…这时(发生另一事)

句型C：haddone…when…刚要做…这时(发生另一事)

1.Wewereabouttosetoutwhenitbegantorain.

我们刚要出发天突然下雨了.

2.Hehadhardlysatdownwhenhiobilerang.

他刚一坐下手机就响了.

3.IwaswalkingalongthebankoftheriverwhenIfellintoit.

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.Whilehiotherwascookinginthekitchen,theboyfellasleepinthechair.

(在一个延续动作过程中发生另一个动作)

2.Hehurriedhom2、强调点不同：e,lookingbehindashewent。

他匆匆回家,边走边往后看。

while后动词ing吗

while后的句子谓语动词并不一定是ing形式，具体需要根据上下文和时态来定，while后的句子时态可以是一般现在时，也可以是过去时态、进行时态等。while的具体用法如下： 1、“当……时候”， 时间状语从句(从句动作必须是延续性的)。 Please don't talk so loud while others are working. While I was cleaning the window，my finger was seriously cut. 2、“虽然，尽管”相当于although，让步状语从句(常把while放在句首)。 While she is a top st

while后面直接加动词时,动词形式一般要分为两种情况.

一、while作名词用,表示“一会儿”“一段时间”

2.如果该动词和主句主语之间为主动关系,则一般用其现在分词形式即Ving.

如：While

watching TV,I heard a knock at my door.

= While (I was) watching TV,I heard a

knock at my door.

3.但是,如果该动词和主句主语之间为被动关系时,则用其过去分词形式.

如：While beaten by his

father,the boy cried.

cried. While的用法

I stayed there for a short while.

（我在那儿呆了一小会儿。）

二、 while 用作连词时，有以下几种含义：

1. 意为“当……时候，和……同时”，时间状语从句。例如：

While I was watching TV， the bell rang.

（我看电视时，铃响了。） 2. 意为“虽然，尽管”，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。）

3. 连接两个并列句子，表示“对比”关系。例如：

（他出去散步了，而我却呆在家里。）

三、 while 状语从句时，应注意以下几点：

1. while 的时间状语从句既可放在句首，也可放在句末；而 while 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。） 2. while 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。） while和when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的时间状语从句多用进行时态，而when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 y3.Ioughttoheedher,butInrcould.esterday ning.

昨天晚上妈妈回家的时候，我正在做家庭作

While作对比时的用法

B：While you’re there, can you get me some stamps? 当你在邮局时，能帮我买几张邮票吗?

一、while作对比时的用法：不可以将whilSome of the studies show itive results, whereas others do not.有一些研究结果令人满意，然而其他的则不然。e放在开头使用。

二、while不同词性释义While连接的两个句子必须是同时发生或同时存在的，不能是一个先发生，另一个后发生。如果一个先发生，另一个后发生，就不能使用While来连接，而应该使用其他连词，如when、before等。：

while作名词时，表示一会儿，一段时间。while作连词时，时间状语。引起让步状语从句时，意思是虽然什么但是什么，尽管什么但是什么，多放于句首。引起条件状语，意思是只要。while作并列连词用，意思为而，然而，表对比。而but表转折。

while后面可以加什么

2.Whilereisawaythereisaway.有志者事竟成.

while后面可以加动词、宾语从句、主语从句。

③由when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，如：

2、宾语从句：While I was working, I heard a knock at my door。

一、讲解

3、主语从句：While the test is true, the experiment doesn't always go that way。

While是可以用来连接两个相关的句子，让我们的语言表达更加连贯、通顺。在写作中，使用While来连接句子，能够让文章更加有条理，让读者更容易理解作者的意思。如果两个句子没有联系，While就不能起到连接的作用，会让句子变得不连贯、不通顺。

1、While连接的两个句子必须是相关的、有联系的。如果两个句子没有联系，While就不能起到连接的作用，会让句子变得不连贯、不通顺。

2、While连接的两个句子必须是同时发生或同时存在的，不能是一个先发生，另一个后发生。如果一个先发生，另一个后发生，就不能使用While来连接，而应该使用其他连词，如when、before等。

3、While一般不用来连接并列句，而是用来连接主从句。主从句的意思是同时发生或同时存在的，因此使用While可以更好地表达句子的意思。