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(完整版)while用法小结

(完整版)while用法小结
(完整版)while用法小结

while用法小结

(1)引导时间状语从句,从句中的谓语动词应用延续性动词或表示状态的词。

eg.While the discussion was still going on,George came in.

当讨论还在进行时,乔治走了进来。

Strike while the iron is hot.

趁热打铁。

★注意:while,when,as表“当……的时候”的区别

while强调同时性或某时间段内一种情况发生时另一种情况出现,与延续性动词连用;when可与延续或非延续性动词连用,在强调“当时”,“这时”之意时when;as强调同时性,指“一边……一边……”一件事情发生,另一件事情立刻发生。

eg.———I’m going to the post office.

———______you’re there,can you get me some stamps?

A.As

B.While

C.Because

D.If

解析:从该题的题意可以看出C、D两选项不合题意;而as侧重同时性,不合题意;while可指一时间段发生某情况时,另一情况出现,正合题意。

(2)引导让步状语从句,多用于句首。意为“尽管,虽然”。

eg.While I admit his good points ,I can see his bad.

尽管我承认他的长处,但我也看到了他的不足。

While he loves his students,he is very strict with them.

虽然他爱他的学生,可是他对他们很严格。

(3)While作并列连词用,意思为“而,然而”,表前后意义上的对比或转折。

eg.There’s plenty of rain in the sout heast,while there's little in the northeast.

东南部雨量充足,而西北部则很少下雨。

Some people waste food while others haven't enough.

有些人浪费粮食,然而有些人却吃不饱。

eg.She thought I was talking about her daughter,_______,in fact,I was talking about my daughter.

A.whom

B.where

C.which

D.while

解析:句意为“她认为我在谈她女儿,而实际上我在谈我的女儿。”whom,which和where分别是引导定语从句的关系代词和关系副词,后一句并非修饰定语从句,故应排除A、B和C选项。

★注意:while与but的区别

二者都有“而,然而”之意,但while强调二者的对比,而but强调前后的转折关系。

(4)引导条件状语,意思是“只要”

eg.While there is a will,there is a way.有志者事竟成。

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。

(5)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。

eg.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。

(6)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。

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。

学习感悟:将一些重点词语的用法总结清楚,不管是做单项选择,还是阅读理解,都会有很大帮助。英语学习只要注重积累,善于总结,就会有所提高。

浅析现在完成时态的用法

浅析现在完成时态的用法 现在完成时是由助动词have(has)+动词的过去分词构成。 一,用法其主要用法有三种: I已完成用法 表示一个过去发生并结束的动作对现在产生的结果和影响。这一类情况可以细致分为下述两种情况。 1).表示开始于过去的动作刚刚结束。常和just,now,already,yet,not…yet等连用。 Li Ming has just turned off the light. 李明刚刚把灯关上。(说明现在灯关上了) I've finished my homework now. 现在我已经做完作业了。(说明可以交作业或做别的了) 2). 表示过去动作的结果,现在仍残留着。一般不用时间状语。 I have lost my pen. 我把笔丢了。 (说明过去某时丢的,现在我还没找到这支笔) She has become a teacher. 她已经当了老师。(说明她现在仍是老师) She has become a teacher. 她已经当了老师。(说明她现在仍是老师) II未完成用法。表示过去已经开始,持续到现在,而且还能继续下去的动作或状态。往往和表示一段时间的状语连用。如today,this week(month),lately,recently,these days,in the past few days,during the last two weeks. since,since yesterday,since 2 days ago,since 1991,for a longtime,for a month,so far,up to now,till(until)now等。 He has lived here for 30 years. 他住在这儿三十年了。(现在还住在这儿) They've known each other since childhood. 他们从小彼此相识。(现在还继续往来) How long have you studied English? 你学英语多久了?(现在仍在学) III经验性用法。表示从过去到现在之间曾经经历过的事情。一般译为汉语“过”,常和often,never,ever,once,twice,three times,before,since等连用。 I have been to the Summer Palace twice. 我曾经去过颐和园两次。 We have visited your school before. 我以前曾去过你们学校。 (过去的经历,但现在依然记得) 二,现在完成时的时间状语 I现在完成时属于现在时范围,故不能和过去的时间状语连用。如:yesterday,last Sunday,in1990,three years ago等。但是,在强调动作产生的后果和影响时,可以和一些表示不确定的时间状语连用。 a. 用副词already和yet。already一般用于肯定句中,yet一般用于否定句和疑问句中。如:We have already finished our homework.我们已完成作业了。 They haven't finished their homework yet.他们还没有完成作业。

连词while考点知识归纳

连词while考点知识归纳 while是大家比较熟悉的一个词,但是许多人对它的了解是不全面的,你可能只知道它表示“当……的时候”,甚至可能还知道它与when, as的用法区别。但是,非常遗憾,你所知道的这些东西都是有关while用法的“基础知识”,却不是一般英语考试的“考点知识”。请看下面两道考题: 1. _________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it. A. If B. While C. Because D. As 2. In some places women are expected to earn money _________ men work at home and raise their children. A. but B. while C. because D. though 这两道题的答案均为B,即均选while。你知道这是为什么吗?下面我们就来归纳一下连词while的“考点知识”。 考点知识一:表示让步,意为“尽管”“虽然”。如: While the work was difficult, it was interesting. 虽然工作有难度,但很有趣。 While we don’t agree we continue to be friends.尽管我们意见不同,我们还是朋友。 While he admitted that he had received the stolen jewellery, he denied having taken part in the robbery. 尽管他承认他收受了盗窃的珠宝,但他否认参与了抢劫案。 While I did well in class, I was a poor performer at games. 虽说我学习不错,我运动却不行。While a few became richer, many did not. 虽然一些人变得更富有了,但多数人并非如此。 考点知识二:表示对比或转折,意为“而”“但是”。如: I went swimming while the others played tennis. 我去游泳,而其余的人则去打网球了。 Air is a fluid but not a liquid, while water is both a fluid and a liquid. 空气是流体不是液体,水是流体也是液体。 Some people waste food while others haven’t enough.一些人糟踏食物而另一些人却食不果腹。注:这样用时,while引出的句子通常位于末,但有时也可位于句首。如: While most children learn to read easily, some need extra help. 大多数儿童学会阅读很容易,有一些儿童却需要特别帮助。 While some languages have 30 or more different vowel sounds, others have five or less. 有些语言有30个或更多的元音,而其他语言只有5个或更少的元音。 现在我们回过头来分析一下上面的两道题:第1题中的while表示让步,全句意为:虽然因特网很有帮助,但我还是认为在其上花太多的时间不是个好主意。第2题中的while表示对比,全句意为:有些地方妇女挣钱,而男子则在家里持家和带孩子。

初中英语常见时态用法小结

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when 和while的用法区别

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; 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。 一。引导时间状语从句时,WHILE连接的是时间段,而WHEN连接的多是时间点 例如What does your father do while your mother is cooking? What does your mother do when you come back? 二,WHILE可以连接两个并列的句子,而WHEN不可以 例如I was trying my best to finish my work while my sister was whtching TV 三,WHEN是特殊疑问词,对时间进行提问,WHILE不是。 例如,When were you bron? 续性动词和短暂性动词 英语中的动词,是学习中的重点,又是难点。英语中的动词有多种分类法。根据其有无含义,动词可分为实义动词和助动词;根据动词所表示的是动作还是状态,可以分为行为动词和状态动词;根据动词所表示的动作能否延缓,分为延续性动词和终止性动词。 可以表示持续的行为或状态的动词,叫做“延续性动词”,也叫“持续性动词”,如:be, keep, have, like, study, live, etc. 有的表示短暂、瞬间性的动词,叫做“终止性动词”,也可叫“短暂性动词”,或“瞬间性动词”,如die, join, leave, become, return, reach, etc.

英语现在完成时态讲解

现在完成时 一、定义:表示一个动作在过去发生并对现在产生影响 表示一个动作由过去发生持续到现在有可能停下,也有可能延续下去 表示一个动作从过去开始发生到目前为止已经发生多次。 二、构成:现在完成时是由“助动词have / has + 动词的过去分词”构成的, 其规则动词的过去分词构成与过去式相同,不规则动词的过去分词则需加强记忆。 如:I have just cleaned my clothes.我刚洗过衣服。 My brother has done his homework already. 我的弟弟已经做完他的作业了。 友情提示:在现在完成时的各种结构中,have, has均为助动词,无实际意义,只起构成时态的作用,不可省略。当主语是第三人称单数时助动词用has,其余人称一律用have。 过去分词 1 、规则动词:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。 四点变化规则: (1)、一般动词,在词尾直接加“ ed ”。 work---worked---worked ,visit---visited---visited (2)、以“ e ”结尾的动词,只在词尾加“ d ”。 live---lived---lived , (3)、以“辅音字母+ y ”结尾的动词,将 "y" 变为 "i" ,再加“ ed ”。 study---studied---studied ,cry---cried---cried , play---played---played ,stay---stayed---stayed (4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“ ed ”。 stop---stopped---stopped , drop---dropped--dropped 2 、不规则动词: AAA型 原型过去式过去分词 burst burst burst cast cast cast cost cost cost cut cut cut hit hit hit hurt hurt hurt put put put set set set shut shut shut

while的用法

While用法小结 一、while作名词用,表示"一会儿""一段时间" 1.She likes to lie down for a while after lunch. 她喜欢午饭后躺一会儿。 https://www.doczj.com/doc/6d2136328.html,ing to another country to study requires a big adjustment and it takes a while to fit in. 来到另一个国家求学,需要花一段时间来适应。 二、While作连词 (1)引导时间状语 1.We must strike while the iron is hot. 趁热打铁。 2.While she was listening to the radio,she fell asleep. 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.While he loves his students,he is very strict with them.. 虽然他爱他的学生,可是他对他们很严格。 2.While these experiments are interesting and useful,it is important to remember that they may not always tell us much. 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。 (3)引起条件状语,意思是"只要" 1.While there is life there is hope.只要生命存在,就有希望。 2.While there is a way there is away. 有志者事竟成。 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.Some people waste food while others haven't enough. 有些人很费粮食,然而有些人却吃不饱。 2.The son was having a good meal at home,while the parents were working in the fields. 儿子在家吃好饭而父母却在田里辛勤劳作。 3.I ought to have helped her,but I never could. 我本该帮她但没能。 4.Honey is sweet,but the bee stings. 蜂蜜很甜,但蜜蜂有刺蜇人。 四.while,when,as的用法区别

高考英语一般现在时用法总结(完整)

高考英语一般现在时用法总结(完整) 一、单项选择一般现在时 1.I know daydreaming benefits invention, but the fact that it has no solid evidence. A.will be remaining B.remained C.remains D.had remained. 【答案】C 【解析】考查动词时态。句意:我知道白日梦有益于发明,但事实是它没有确凿的证据。根据所给动词是一般现在时和句意可知此处也用一般现在时,故选C. 2.The Small Goose Pagoda in Xi’an, one of the 22 Silk Road relics located in China, _______ back in 707 during the Tang Dynasty. A.dated B.was dated C.dates D.is dating 【答案】C 【解析】 试题分析:考查动词短语和时态。短语date back to追溯到....;从....开始有;该句型没有被动语态,也没有进行时。通常都使用一般现在时表示从现在时间某一事物能够追溯到的时期。故C项正确。 【名师点睛】 当分词做状语的时候,要特别考虑主被动关系以及时间的先后关系。如果构成分词的动词与句子的主语构成主动关系,就使用现在分词做状语;当二者构成被动关系,使用过去分词做状语。如果分词的动作发生在谓语动词之前,就使用分词的完成式。如果分词与句子的主语没有关系,可以使用状语从句或者独立主格结构。 考点:考查动词短语和时态 3.We live in a beautiful cottage with a yard, which ______ 20 feet from side to side. A.measures B.is measured C.measured D.has been measured 【答案】A 【解析】 试题分析:考察非谓语。句意:我们住的地方有一个院子,这个院子从一遍到另一边的距离是20英尺。 考点:考察非谓语。 4.---We’d better leave now. ---No hurry. The train ______ at 10 o’clock. A.has left B.left C.leaves D.would leave 【答案】C

when和while的用法解析、练习题及答案(附总结表格)

when和while的用法解析、练习题及答案(附总结表格) 一、讲解三例句: 1. The girls are dancing while the boys are singing. 2. Lucy’s mother is cooking when she gets home. 3. When/While Lucy’s mother is cooking, she gets home. 二、用when或者while填空 1.______ Margo was talking on the phone, her sister walked in. 2.______ we visited the school, the children were playing games. 3.______ Sarah was at the barber’s, I was going to class. 4.______ I saw Carlos, he was wearing a green shirt. 5.______ Allen was cleaning his room, the phone rang. 6.______ Rita bought her new dog; it was wearing a little coat. 7. He was driving along ________ suddenly a woman appeared. 8. _____ Jake was waiting at the door, an old woman called to him. 9. ______ it began to rain, they were playing chess. 10. She saw a taxi coming ______ the woman was waiting under the streetlight. 三、语法 while和when都是表示同时,到底句子中是用when还是while主要看主句和 从句中所使用 的动词是短暂性动作(瞬时动词)还是持续性动作。 1、若主句表示一个短暂性动作,而从句表示的是一个持续性动作时,用 When/While。如: He fell asleep when while he was reading. 他看书时睡着了。

最新英语一般现在时用法总结(完整)

最新英语一般现在时用法总结(完整) 一、单项选择一般现在时 1.We’ll go to play with snow if it ______ tomorrow. A.snow B.snows C.will snow D.snowed 【答案】B 【解析】 【详解】 考查if引导的条件状语从句。句意:如果明天下雪,我们就去玩雪。此处是if引导的条件状语从句,主句是一般将来时态,从句用一般现在时态,且主语是it,故答案为B。 2. you read the instructions closely, you would know what I . A.Had, was B.Should, am C.Had, am D.If, was 【答案】C 【解析】 句意:如果你仔细阅读了说明,你就会知道我现在指的是什么了。根据句意可知条件状语从句与过去的事实相反,在条件状语从句中,若if省略,需将should /had/were提前。主句中“我现在指的是什么”是客观事实,故用am。故选C。 3.Whenever you ______ a present, you’d better think about it from the receiver’s preference. A.bought B.buy C.will buy D.have bought 【答案】B 【解析】 试题分析:句意:每当你买礼物的时候,你最好从接收方的偏好想一想。whenever引导的让步状语从句,采用一般现在时表将来的用法。故选B。 考点:考查动词的时态。 4.The Dragon Boat Festival ________ the beginning of the hottest season of the year. A.is marking B.marks C.will mark D.marked 【答案】B 【解析】 试题分析:考查时态。一般现在时表示经常性习惯性的行为。本句中使用一般现在时端午节标志着一年中最热的季节的开始。故B正确。 考点:考查时态 5.Every time he ______ to visit me, he ______ buy me some books. A.will come; will B.will come; would C.comes; will D.comes; would 【答案】C

WHEN与WHILE用法区别

WHEN与WHILE用法区别 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。

人教版英语英语现在完成时用法总结含答案推荐精选

人教版英语英语现在完成时用法总结含答案推荐精选 一、初中英语现在完成时 1.—Where is Catherine? I haven't seen her for days. —She Wuhan. She'll be back next week. A. has gone to B. has been to C. have gone to D. have been to 【答案】 A 【解析】【分析】句意:——Catherine在哪里?我好几天没见她。——她已经去武汉了。她将下周回来。主语是she,所以用has,排除C、D。A.已经去了某地,在去的路上,还没有回来;B.已经去过某地,表示去了某地,并且回来了。根据She'll be back next week.她下周回来可知现在还没有回来,故选A。 【点评】考查短语辨析,注意平时识记其区别,理解句意。 2.Mike used to be a top student, but he behind since he lost himself in computer games. A. fell B. has fallen C. was D. has been 【答案】 D 【解析】【分析】句意为“Mike过去是尖子生,但自从迷上电子游戏以来成绩落后了”。由since可知but后的主句用现在完成时,瞬间动词fall不能和since引导的时间状语从句连用,故用延续性动词be。故选D。 【点评】本题考查现在完成时中非延续性动词和延续性动词的转换。 3.The Greens many places of interest since two years ago. A. has visited B. have visited C. visited D. will visit 【答案】 B 【解析】【分析】句意:自两年前开始,格林一家参观了许多名胜。since引出的时间状语从句,强调主句谓语从过去某时一直延续到现在,主句用现在完成时态,the Greens格林一家,表示复数含义,作主语,谓语用复数形式。故选B。 4.—Your new bike is so nice! When did you buy it? —In July. I _____it for two weeks. A. had B. have had C. have bought D. bought 【答案】 B 【解析】【分析】句意:——你的新自行车那么好看。你什么时候买的。——七月份,我买了两周了。根据for two weeks,可知句子时态为现在完成时,而且谓语动词必须是延续性的。因此排除AD,buy是结束性动词,不能够延续,应此排除,故答案是B。

英语中连词while的用法归纳

英语中连词while的用法归纳 连词while除具有“当时”、“同时”等意义外,根据上下文还有以下不同含义及其不同译法。 一、引导时间状语从句 译作“当……时”。例如: 1. Make hay while the sun shines. 趁着有太阳晒晒草。 (乘机行事,抓紧时机。) 2. We must work hard to gain more knowledge while we are young. 趁着现在还年轻,我们必须刻苦学习,获得更多的知识。 二、引导让步状语从句 常放在句首,译作“尽管”、“虽然”,比although或though语气要轻。例如: 1. While I believe it is true, I cannot prove it. 虽然我相信那是真的,但我无法证明。 2. While any kind of athletic shoe can provide a certain amount of r ebound, energy-return sneakers are designed to maximize this effect. 虽然任何一种运动鞋都能提供一定的反弹力,但回力运动鞋能够使这种效果最大化。 三、引导条件状语从句 相当于as long as,译作“只要”。例如: 1. While there is life, there is hope. 有生命,就有希望。 2. While a spark of life remains, it is a doctor's duty to save the pat ient.

只要病人还有一息生机,医生就有责任挽救。 四、引导原因状语从句 相当于since,有“既然”的意思。例如: 1. You'll never save any money while you're so extravagant. 你这么奢侈,永远存不下钱来。 2. I'd like to get it settled today while we're at it. 既然我们着手干了,我想今天就把它干完。 五、连接并列句 表示对比,相当于whereas,译作“而”、“可是”。例如: 1. An outdoors man will soon become pale if he changes to an indo or job, while a desk clerk will take on a tan after a short vacation in the sun. 从事室外工作的人如果调到室内工作,不久肤色就会变白;而一个伏案工作的文员出去度个短假,就会被太阳变黑。 2. Motion is absolute while stagnation is relative. 运动是绝对的,而静止是相对的。 六、连接并列句 表示递进,相当于and what is more, 译作“并且”、“而且”。例如: 1. The new man-made fibres are more hardwearing than natural fibres and greatly reduce mending, while good ready-made clothes are cheap and pl entiful. 新的人造纤维比天然纤维耐磨,因此能大大减少修补工作,而且做好的衣服价廉物美,数量也多。 2. Of course, I resolutely determined not to marry, while I quite forg ot to consider at all that great rock of disaster in the working-class world-- sic kness. 当然, 我下定决心不结婚,而且把工人阶级的巨大灾难——疾病,也忘得一干二净。

一般现在时总结归纳

一般现在时语法总结 一般现在时:表示经常性的事情,经常性的动作或一般性事实。 时间状语:often 经常,usually 通常,always 总是,every 每个,sometimes 有时,at……在点钟 只有在第三人称单数用动词的三单变化,其他用动词的原型。 1.三单变化: (1)多数在动词后面加- s ask->asks work->works get->gets stay->stays (2)以字母s x ch sh或o结尾的动词,在词尾直接加- es Watch -> watches wish -> wishes fix -> fixes do -> does go -> goes pass -> passes (3)以辅音字母加y结尾的动词,要先变y为i再加- es Try -> tries study -> studies cry -> cries fly -> flies 2.不规则变化 be-> am is are have->has 一般现在时的用法: 表示经常性或习惯性的状态;表示客观事实或普遍真理;在时间、条件等状语从句中,用现在时表示将来;在某些以here,there开头的句子中,用一般现在时表示正在发生的动作1>经常性或习惯的动作,常与表示频率的时间状语连用。 时间状语:every、sometimes、at……,on Sunday I leave home for school at 7 every morning. 2>客观真理,客观存在,科学事实 The earth moves around the sun. Shanghai lies in the east of china. 3>表示格言或警局中 Pride goes before fall. (骄者必败) 注意:此用法如果出现在宾语从句中,即使主句是过去时,从句谓语也要用一般现在时。例:columbus proved that earth is round. 4>现在时刻的状态、能力、性格、个性 I dont want so much.

while、when和as的用法区别

as when while 的区别和用法 as when while的用法 一、as的意思是“正当……时候”,它既可表示一个具体的时间点,也可以表示一段时间。as可表示主句和从句的动作同时发生或同时持续,即“点点重合”“线线重合”;又可表示一个动作发生在另一个动作的持续过程中,即“点线重合”, 但不能表示两个动作一前一后发生。如果主句和从句的谓语动词都表示持续性的动作,二者均可用进行时,也可以一个用进行时,一个用一般时或者都用一般时。 1、As I got on the bus,he got off. 我上车,他下车。(点点重合)两个动作都是非延续性的 2、He was writing as I was reading. 我看书时,他在写字。(线线重合)两个动作都是延续性的 3、The students were talking as the teacher came in. 老师进来时,学生们正在讲话。(点线重合)前一个动作是延续性的,而后一个动作时非延续性的 二、while的意思是“在……同时(at the same time that )”“在……期间(for as long as, during the time that)”。从while的本身词义来看,它只能表示一段时间,不能表示具体的时间点。在时间上可以是“线线重合”或“点线重合”,但不能表示“点点重合”。例如: 1、He was watching TV while she was cooking. 她做饭时,他在看电视。(线线重合) 2、He was waiting for me while I was working. 我工作的时候,他正等着我。(线线重合) 3、He asked me a question while I was speaking. 我在讲话时,他问了我一个问题。(点线重合)

现在完成时态的用法

2012,2月8-9日时限:90分钟(共两页)家长签字: 现在完成时:H a v e/h a s+过去分词 用法 I.(曾经)做过某事 I_________(s e e)t h i s f i l m.他看过这部电影。 2.T h e y_____(r e a d)t h i s b o o k.他们读过这本书。 3.____y o u____(c l i m b)t h e m o u n t a i n?你爬过山吗? I I.已经完成某事了 1.我写完作业了I________(w r i t e)m y h o m e w o r k. 2.我读完这本书了I_________(r e a d)t h i s b o o k. 3.我吃了饭了I_______(h a v e)d i n n e r. I I I.动作已经发生了,但强调的是现在 1H e____(f i n d)t h e s e c r e t.(暗含的意思:他现在已经知道秘密了)2.T h e y____(f i n d)t h e i r c h i l d.(暗含的意思:他们找到了孩子,他们现在很高兴) 3.I____(l o s e)m y p e n.(暗含的意思:我找到钢笔了,我现在不麻烦了) I V.过去的动作或者状态一直持续到现在,与f o r,s i n c e连用 用f o r和s i n c e填空 1.I h a v e s t u d i e d E n g l i s h____t h r e e y e a r s. 2.S h e h a s l i v e d t h e r e___2000 3.H e h a s b e e n h e r e____t h r e e m o n t h s a g o. 4.W e h a v e t a u g h t E n g l i s h____s e v e n t e e n y e a r s. 5.H e h a s k n o w n u s___I c a m e t o t h i s s c h o o l. V.延续性动词和短暂性动词 延续性动词可以和f o r,s i n c e引导的一段时间连用,而短暂性性动词则不能。 句型转换 1.T o m c a m e h e r e t w o h o u r s a g o T o m______________f o r t w o h o u r s 2.L i n g l i n g l e f t B e i j i n g t w o y e a r s a g o. 1

While的用法

While的用法 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。) Tom watched TV while she ate her supper.(汤姆边吃晚饭边看电视。) 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

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