亖呉?盀
in a while一般用于句首、句中还是句末？？还有after a while和for a ...
in a while句末例句：I will leave for Beijing in a while（我马上就去北京）after a while句首例句After a while,we began to have a picnic。
过不久，我们就开始野餐for a while 也是句末例句I have watched TV for a while（我只看了一会儿电视）
while的用法
从一道高考题综述while的用法 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. As B. While C. Because D. If 对连词的用法考查在每年高考题中均有涉及。
Because引导原因状语从句， If引导条件状语从句，按题干提供的情景均不可取。
While和As都能引导时间状语从句，极易混淆。
As一般强调主句谓语动词与从句谓语动词动作的同时性，而While除可表示同时性外，还含有一个动作在另一个动作正在进行或持续过程中的某一时刻发生。
再从题干所提供的情景判断，就可知道B为最佳答案。
while的用法可从下述几点理解与运用。
一、while意为\＂当......时候\＂，指一段时间，不能用来表示一个时间点。
While the discussion was still going on, George came in. 当讨论还在进行时，乔治走了进来。
二、while意为\＂而；然而\＂，表示转折。
There\”re plenty of rain in the southeast, while there\”s little in the northeast. 东南部雨量充足，而西北部则很少下雨。
三、while意为\＂虽然；尽管\＂，表示让步。
While I admit his good points, I can see his shortcomings. 尽管我承认他的优点，但我还是能看到他的缺点。
四、while意为\＂只要\＂，表示条件。
We can surely overcome these difficulties while we are closely united. 只要我们紧密地团结一致，一定能克服这些困难。
五、while从句中的省略。
当while从句中的主语与主句的主语一致，且含有be的某种形式时，从句中的主语连同be可同时省略。
While listening to the radio, she fell asleep. 她在听收音机时睡着了。
While in London, he studied music and painting. 在伦敦时，他学习音乐和绘画。
六、while可用作名词，意为\＂一会儿；一段时间\＂。
作名词用时，主要用于短语中： after a while \＂过了一会儿\＂； all the while \＂一直，始终\＂； a short / little while ago \＂刚才\＂； once in a while \＂偶尔，间或\＂； wait / rest(for) a while \＂等 / 休息一会儿\＂。
I haven\”t seen her for a long while.我好久没有看见她了。
Where have you been all this while？这一阵子你到哪去了？ He usually goes to work by bike, but once in a while he goes by bus. 他通常骑自行车上班，但偶尔也乘公共汽车。
I looked everywhere for the letter, but it was in my pocket all the while. 我到处找那封信，却不知它一直在我口袋里。
七、while与when以及as之间的区别。
1. 当从句中的谓语动词是持续性的动作时，我们可以用while, when或as。
While / When / As I was walking down the street, I noticed a police car in front of the bank.我顺着马路往前走时，发现银行门前停着一辆警车。
2. 当从句中的谓语动词表示瞬间动作时，不可用while。
He was on the point of leaving when someone knocked at the door. 他正要走，这时有人敲门。
3. 如果谈论两个长动作，最常用的是while。
While John was sitting biting his nails, I was working out a plan to get us home. 约翰坐在那里咬指甲时，我想出了一个回家的办法。
不过， as是可以用来说明两种正在发展或变化的情况的，这时as引导一个持续性的动作，主句中的动作与之同时进行。
As we talked on, he got more and more excited. 我们继续往下谈的时候，他越来越兴奋。
4. 如果表示两个短动作或事件同时发生，最常用的是as或just as，也可用when。
Just as he caught the ball, there was a tearing sound. 当他抓住球的时候，有一种撕裂的声音。
I thought of it just when you opened your mouth. 就在你要说话的时候，我也想到了。
求大神解答 在SQL中用while循环做添加语句 做出一个回子
我写了一个可以实现的效果，你试试CREATE TABLE #T (A CHAR(1),B CHAR(1),C CHAR(1),D CHAR(1),E CHAR(1),F CHAR(1),G CHAR(1),H CHAR(1),I CHAR(1),J CHAR(1),K CHAR(1),L CHAR(1),M CHAR(1))DECLARE @NEXT INT,@NEXT2 INTDECLARE @SQL NVARCHAR(100)SET @NEXT=1WHILE @NEXTBEGIN set @NEXT2=1SET @SQL='INSERT INTO #T VALUES(''Z'''while @NEXT2BEGINIF @NEXT IN(1,13) OR @NEXT2=12BEGINSET @SQL=@SQL+',''Z'''ENDELSE IF @NEXT IN(3,11) AND @NEXT2 NOT IN(1,11)BEGINSET @SQL=@SQL+',''Z'''END ELSEIF @NEXT IN(5,9) AND @NEXT2 NOT IN(1,11,3,9) BEGINSET @SQL=@SQL+',''Z'''END ELSEIF @NEXT2 IN(2,10) AND @NEXT NOT IN(1,2,3,11,12,13) BEGINSET @SQL=@SQL+',''Z'''END ELSEIF @NEXT2 IN(4,8) AND @NEXT IN(5,6,7,8,9) BEGINSET @SQL=@SQL+',''Z'''END ELSEBEGINSET @SQL=@SQL+','' '''END SET @NEXT2=@NEXT2+1END SET @SQL=@SQL+')'execute sp_executesql @SQLSET @NEXT=@NEXT+1END SELECT * FROM #TDROP TABLE #T 效果图：
任何一个while语句是否都可以用for语句来改写？任何一个for语句是否...
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。
谓语动词是与非谓语动词相对应的概念.两者都是动词，但是前者是作谓语成分，后者不能作谓语成分.而谓语成分就是用来说明主语的动作或状态的，一般由动词或短语动词承担. 比如：我看电视.”看”就是谓语. 你正在上网.”上网”也是谓语. 再举几个英语句子吧：I see a girl.我看见一个女孩.”看见””see＂就是这个句子的谓语.而see也是个动词，所以就叫做谓语动词.She is very beautiful.她很漂亮.＂is＂就是这个句子的谓语，也是动词. 从句是指用于复合句中担当某个句子成分的主谓结构。
虽说从句自身的句子结构是完整的， 但是它不能视为独立的句子，因为它离开了主语就无法独立、完整地表达意思。
按其所能表达的意义而言，它相当于一个词或是一个词组.例如： 1) Because they talk at home while the television is on , many people think they can talk at movies as well . （状语从句）许多人在家里是边看电视边谈话，所以他们认为在电影院也可以如此。
2) Whether he comes or not doesn't make any difference to me . （主语从句） 他来与不来对我都一样。
3)There is disagreement among economists about what money is and how money is measured（宾语从句）什么是货币以及怎样计量货币经济学家之间存有分歧。
4) China is not what it used to be . （表语从句）中国不是它过去的样子了。
5) Is there any proof that the food of plant differs from that of animals ？ （同位语从句）有没有什么证据说明植物性食品不同于动物性食品？ 6) Taxes consist of money that people pay to support their government . （定语从句） 税款是人们支持政府而交的钱。
如果将上面的复合句中所有的从句都独立出来，那将是这样的： 1) Because they talk at home while the television is on 2) Whether he comes or not 3) what money is and how money is measured 4) what it used to be 5) that the food of plant differs from that of animals 6) that people pay to support their government 我们很容易看出，上面的所有这些句子既不是陈述句、疑问句，也不是祁使句，更不是感叹句。
也就是说，它们不是独立的句子；也只有在附属于主句后才能获得意义如下：1）因为许多人在家里是边看电视边谈话 2）他来与不来 3）什么是货币以及怎样计量货币 4）它过去的样子5）植物性食品不同于动物性食品6）人们支持政府而交的上面的这些句子在我们中文里如同是人们常说的＂半截话＂；在英文中也就是个＂词或词组＂了。
B. 我们虽然说过，从句自身的句子结构基本是完整的，但是它不同于＂独立句子＂的是--每个从句的最前面都好象＂戴了顶帽子＂即：从属关系词。
由此可以看出，从句的另一个特点是：从属关系词总是立于从句之首. C. 从句的再一个特点是：一般说来（除少数倒装的情况外），从句中的语序应该是正常语序。
D. 关于从句种类的划分有两种方法：按从句的词性划分和按从句的句子功能划分。
如果按从句的词性划分，从句可分为三种：名词从句、形容词从句和副词从句。
如果按从句的句子功能划分（也就是按从句在句子中所担任的成分来划分），从句可分为：主语从句、宾语从句、 表语从句、同位语从句、定语从句和状语从句。
其实，这两种划分从句的方法在逻辑上是一致的.我们知道，能在句子里充当主语、宾语、表语和同位语的往往是名词、代词等，所以名词从句涵盖了主语从句、宾语从句、表语从句和同位语从句。
形容词和副词常分别在句中担当定语和状语，所以，形容词从句和副词从句其实分别是定语从句和状语从句。
名词从句名词从句在句中是一个相当于名词的主谓结构。
我们在前面说过，名词从句含盖了主语从句、宾语从句、表语从句和同位语从句。
连接这些从句与主句的关系词主要有三类： 1.从属连词：that（无有词义） ， whether（是否） ，if （是否） 2.关系代词：who（谁，主格） ， whom（谁，宾格），whose谁的，所有格） ， what（什么），which（哪个，哪些） 3.关系副词：...
网上看到一个句子看不懂了,英语大大帮个忙....
after a while 不久，过一会儿 After a while,he was asleep.in a while adv.过一会，过不久 once in a while 偶尔 She haves a headache once in a whilefor a short while 暂时 短短一会儿 The road is closed to traffic for a short while.区别：after a while 可以看做是个时间状语是某一时间点 after + 一段时间 = 一段时间 + later in a while 通常是 once in a while 的形式 表示not ofte
用括号中的词连接句子高一英语链接教材1....
为你解答.1、Caitlynd (who)was walking ahead of me stopped at once (when) she asw the teenager.2、The only thing Caitlynd noticed about the teenager was a fact (that) is that his arms were full.3、I was busy preparing the traditional Thanksgiving turkey (when) the doorbell rang.4、Come in (and) I'll make you a cup of hot cocoa.5、Let them be for a while, I thought. (in case) I should begin to feel how rich I am.6、（Long before） free plastic bags were banned in China earlier this month, some people had begun distancing themselves from the downsides of modern life.7、（Instead of） joining the race to drive the best car, wear the best clothes, these individuals had decided on a life of ＂voluntary simplicity＂.8、I feel relaxed (when) washing clothes with the music on.
高考英语作文万能句子
一、英语书信的常见写作模板 开头部分： How nice to hear from you again. Let me tell you something about the activity. I'm glad to have received your letter of Apr. 9th. I'm pleased to hear that you're coming to China for a visit. I'm writing to thank you for your help during my stay in America. 结尾部分： With best wishes. I'm looking forward to your reply. I'd appreciate it if you could reply earlier. 二、口头通知常见写作模板 呼语及开场白部分： Ladies and gentlemen, May I have your attention, please? I have an announcement to make. 正文部分： All the teachers and students are required to attend it. Please take your notebooks and make notes. Please listen carefully and we'll have a discussion in groups. Please come on time and don't be late. 结束语部分： Please come and join in it. Everybody is welcome to attend it. I hope you'll have a nice time here. That's all. Thank you. 三、议论文模板 1.正反观点式议论文模板 导入： 第1段：Recently we've had a discussion about whether we should... （导入话题） Our opinions are divided on this topic.（观点有分歧） 正文： 第2段：Most of the students are in favour of it.（正方观点） Here are the reasons. First... Second... Finally...（列出2~3个赞成的理由） 第3段：However, the others are strongly against it. （反方观点） Their reasons are as follows. In the first place... What's more... In addition...（列出2~3个反对的理由） 结论： 第4段：Personally speaking, the advantages overweigh the disadvantages, for it will do us more harm than good, so I support it.（个人观点） オ 2.“A或者B”类议论文模板： 导入： 第1段： Some people hold the opinion that A is superior to B in many ways. Others, however, argue that B is much better. Personally, I would prefer A because I think A has more advantages. 正文： 第2段：There are many reasons why I prefer A. The main reason is that ... Another reason is that...（赞同A的原因） 第3段： Of course, B also has advantages to some extent... （列出1~2个B的优势） 结论： 第4段： But if all these factors are considered, A is much better than B. From what has been discussed above, we may finally draw the conclusion that ...（得出结论） 3.观点论述类议论文模板： 导入： 第1段：提出一种现象或某个决定作为议论的话题 As a student, I am strongly in favour of the decision. （亮明自己的观点是赞成还是反对） The reasons for this may be listed as follows. （过渡句，承上启下） 正文： 第2段：First of all... Secondly... Besides...（列出2~3个赞成或反对的理由） 结论： 第3段：In conclusion, I believe that... （照应第1段，构成＂总—分—总＂结构） 4.＂How to＂类议论文模板： 导入： 第1段：提出一种现象或某种困难作为议论的话题 正文： 第2段： Many ways can help to solve this serious problem, but the following may be most effective. First of all... Another way to solve the problem is ... Finally...（列出2~3个解决此类问题的办法） 结论： 第3段：These are not the best but the only two/ three measures we can take. But it should be noted that we should take action to...（强调解决此类问题的根本方法） 四、图表作文写作模板 The chart gives us an overall picture of the 图表主题. The first thing we notice is that 图表最大特点 . This means that as （进一步说明）. We can see from the statistics given that 图表细节一 . After 动词-ing 细节一中的第一个变化， the动词-ed+幅度+时间（紧跟着的变化） . The figures also tell us that图表细节二 . In the column, we can see that accounts for （进一步描述）. Judging from these figures, we can draw the conclusion that （结论）. The reason for this, as far as I am concerned is that （给出原因）. / It is high time that we （发出倡议）. 五、图画类写作模板：1.开头 Look at this picture./The picture shows that.../From this picture, we can see.../As is shown in the picture.../As is seen in the picture... 2.衔接句 As we all know, .../As is known to all,.../It is well known that.../In my opinion,.../As far as I am concerned,.../This sight reminds me of something in my daily life. 3.结尾句 In conclusion.../In brief.../On the whole.../In short.../In a word.../Generally speaking.../As has been stated...
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