高考英语 作文句型 when引导的从句

2012高考英语作文句型when引导的从句

when引导的从句

when除了用来引导主语从句、宾语从句、时间状语从句、表语从句和定语从句，还有一种用法值得关注，那就是when引导并列分句，意思是“这时突然;就在那时”，强调另一个动作的突然发生。常用于以下句型中：(1)、主语+ be doing… when…意思是“正在做某事这时……”;(2)、主语+ be about to do…when…;(3)、主语+be on the point of (doing) …when…意思是“正要去做某事这时……”

[例句]

One day Chuck was on a flight across the Pacific Ocean when suddenly his plane crashed. 有一天，Chuck正在太平洋上飞行，这时他的飞机突然爆炸了。

I don’t know when he will arrive. 我不晓得他什么时候到达。

I thought of the happy days when I was in Beijing. 我想起了在北京时的那段快乐日子。

I believe the time will soon come when there will be no weapons in the world. 我相信世界上没有武器的日子不久就会到来。

I was walking along the river when I heard a drowning boy cry for help. 我正在河边行走，这时我突然听到一个落水男孩求救。

I was about to leave when it began to rain. 我刚要离开，这时下雨了。

I had just finished my exam paper when the bell rang, announcing the class was over. 我刚做完作业，下课铃响了。

I thought of the happy days when I was in France. 我想到了在法国时那段快乐日子。

I believe the time will soon come when there will be no weapons in the world. 我相信世界上没有武器的日子不久就会来临。

[比较]

I was walking along the street when I caught sight of a tailor’s shop. 我正在街上走，这时我看见一家裁缝店。

I was walking along the streets. Just at the moment I caught sight of a tailor’s shop. 我在街上走。就在那时我看见一家裁缝店。

when 和 where 引导定语从句的用法

when 和 where 引导定语从句的用法 定语从句既是英语语法的一个重点，同时又是一个难点。说它是难点，主要难在两点上：一点是如何正确判断什么样的汉语句子要译为英语的带定语从句的复合句；另一点是定语从句的引导词较多(包括关系代词who, that, which, as 和关系副词when, where, why)，而且其用法也较复杂。那么到底什么情况下用when和where来引导定语从句呢？它们又该怎么用呢？下面就举例说明： 一、when：当主句中的先行词(即主句中被后面定语从句修饰的词)是表示时间意义的名词时，它只能作定语从句的时间状语，放在定语从句句首。如果定语从句的引导词是作该定语从句的主语或宾语，则要改用关系代词that或which来引导。例如： The days when we used foreign oil are gone. 我们用洋油的日子一去不复返了。 I'll never forget the day when I was born. (=I'll never forget my birthday.) 我永远不会忘记我出生的日子。 It happened in November when the weather was wet and cold. 这事发生在天气又湿又冷的十一月。 In the years that (which) followed, Marx kept on studying English and using it. 在这之后的几年中，马克思继续学习和使用英语。(that作定语从句"that followed"的主语) The day (that) I always remember in all my life is my birthday. 我一生中最难忘的日子是我的生日。(that作定语从句"that I always remember in all my life"的宾语，that可以省略)

where引导的定语从句修饰抽象名词

where引导的定语从句修饰抽象名词。 一、where定语从句修饰抽象名词point You reach a point where medicine can’t help. 你已到了药物无法治疗的地步。 The crisis has reached a point where the receiver will have to be called in. 危机已达到非把破产管理人叫来不可的地步。 We have reached a point where a change is needed. 我们到了必须改一改的地步。 注：有时point也可以是具体的地点： Let the point where AB cuts CD be called E. 设AB线与CD线的相交点为E。 The accident happened at the point where the A15 joins the M1. 事故发生在A15与M1交叉的十字路口。 二、where定语从句修饰抽象名词case There are cases where the word “mighty” is used as an adverb. 在一些情况下，mighty一词可用作副词。 Today, we’ll discuss a number of cases where beginners of English fail to use the language properly. 今天，我们将讨论一些英语初学者对英语使用不当的问题。 三、where定语从句修饰抽象名词activity Those successful deaf dancers think that dancing is an activity where sight matters more than hearing. 那些失聪的成功舞蹈演员们认为，舞蹈是一种让人看胜过让人听的活动。 四、where定语从句修饰抽象名词situation He got into a situation where it is hard to decide what is right and wrong. 他陷入一种难以分辨是非的局面。 If you risk something important, you cause it to be in a dangerous situation where you might lose it. 你如果拿重要的东西去冒险，那你就是将它置于一种可能会失去它的危险境地。 五、where定语从句修饰抽象名词position It’s put me in a position where I can’t afford to take the job. 这使我陷入一种不能接受此工作的境地。 六、where定语从句修饰抽象名词job

which,who引导的定语从句教案资料

which, who引导的定语从句 看下面的几个例句： It successfully shows the rich culture which makes Beijing so famous. 它成功地展示了使北京闻名遐迩的悠久文化。 The photo which we liked best was taken by Zhao Min. 我们最喜欢的照片是赵敏照的 先行词是物 It successfully shows the rich culture which makes Beijing so famous. 引导词在从句中作主语 先行词是物 The photo which we liked best was taken by Zhao Min. 引导词在从句中作宾语 由此，我们可以看出：which引导的定语从句修饰的是无生命的东西。which 在从句中的成分是可以作主语，也可以作宾语。 下面我们再看一个句子： 先行词是人 His father is the person who will be most unhappy. 引导词在从句中作主语 由此，我们可以看出： 如果先行词是人，那么定语从句的引导词就可以是who。 注意：当who 在从句中作宾语时，在现代语法规则简化为大多数情况下都可用who了。 如：Do you know Mr Zhang who(m) they like very much? 在先行词是物的定语从句中，一般情况下that和which都可以通用, 但在下列情况下, 一般用that而不用which。 (1)先行词为all, everything, nothing, something, anything, little, much 等不 定代词时。 I am sure she has something that you can borrow. (2).先行词被all, little, much, every, no, 等修饰时。 I’ve read all the books that are not mine. (3)先行词被序数词或最高级修饰时。 This is the first book that he has read (4)先行词被the only, the very, the same, the last修饰时。 This is the very book that belongs to him. (5)先行词为人和物的组合。 They talked for an hour of things and persons that they remembered in the

When引导的定语从句与时间状语从句的区分

一、从句是如何出题的？ 1. 时态 2. 考连接词 3. 考语言顺序 二、学好从句的两个基本条件 1. 时态 2. 从句的三个必须:①必须是句子；②必须有连接词；③必须是陈述句 三、状语从句、宾语从句、定语从句重点 1.如何判断何种从句 2. 从句的时态 3. 从句的连接词与扩展 4. 经典单选、从句与选词、长句子分析 四、如何判断三种从句 1. 状语从句无先行词 2. 宾语(表语)从句无先行词有动词或词组 3. 定语从句先行词多为名词或代词 一、When引导的定语从句与时间状语从句的区分 1. when的译法不同。在时间状语中，when 翻译成“当……的时候” I want to be a teacher when I grow up. 当我长大的时候，我要做一名老师。在定语从句中，when不翻译。I won't forget the day when he says he loves me. 我不会忘记他说爱我的那一天。 2. 在时间状语中，when从句前面或后面是句子；定语从句中，when 从句不能位于句首，且通常when前为表示时间的名词day、year等。 3. when在从句的作用不同。在时间状语从句中，when是连词，只起连接主句和从句的作用，不做从句的任何成分。不过when引导的时间状语从句修饰主句的谓语，做主句的时间状语。 在定语从句中，when是关系副词，在从句中代替先行词做从句的时间状语，修饰从句的谓语。 例1 I will always remember the days when I lived with my

grandparents in the country. 例2 I always remember the days in the country when I see the photo of my grandparents. 点评：例1意为“我会永远记得跟我祖父母一起住在乡下的那些日子”，其中when 引导的是一个定语从句, 修饰the days, when在从句中作时间状语。例2意为“当我看到祖父母的照片时，总是会想起在乡下的那些日子”，其中when 引导的从句并不修饰前面的名词the country，因此可判定为时间状语从句。 例1中的when可用in which替代，即从句可改为...in which I lived with my grandparents in the country. 例2中从句前有名词，但根据句意可 知并不是从句所修饰的对象，也不能用“介词+ which”来替代。 二、判断关系代词与关系副词 方法一：用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。例如： This is the mountain village where I stayed last year. 这是我去年呆过的山村。 I'll never forget the days when I worked together with you. 我永远不会忘记与你共事的日子。 判断改错： 1. This is the mountain village where I visited last year. 2. I will never forget the days when I spent in the countryside. 3. This is the mountain village （which）I visited last year.

where引导定语从句的用法

Where引导定语从句,先行词不一定都表 示地点 1、We will discuss a number of cases __ beginners of English fail to use the language preperly、A、which B、as C、why D、where 2、He was driving so fast as to get himself into a dangerous situation ___he is likely to lose the control over his car、 A、which B、as C、why D、where 两道题都选where ,但就是case, situation都不就是地点,如何理解？ 在“先行词不就是表示地点的名词”的前提下,如何判断就是否使用关系副词where来引导定语从句的问题就是一个高频考点。就就是说,关系副词where 所指代的先行词不只就是表示地点的名词。

用Where引导定语从句,先行词不一定都表示地点按照通常的理解,当where 引导定语从句时,它的先行词就就是表示地点的名词,但事实并不就是我们想象的那么简单。很多情况下,where所指代的先行词并不表示地点。请瞧以下几个例句: Other research, where siblings have been asked to say who their mother and father favor, suggests that mothers do tend to show a preference for their first-born son, but fathers often show great affection for their youngest daughters、 1、Remember that the best relationship is one where your love for each other is greater than your need for each other、请记住,最深的感情关系表现为彼此间的爱超过彼此间的需要。

定语从句中that与who的用法区别

定语从句中that与who的用法区别 1. 两者均可指人，有时可互换（包括当先行词为all, anyone, someone等，同时也包括先行词受the only 等的修饰时）： All that [who] heard him were delighted. 所有听了他讲话的人都很高兴。 He is the only one among us that [who] knows Russian.他是我们中间唯一懂俄语的人。 Anyone who [that] is over sixteen is allowed in. 任何超过十六岁的人都允许进去。 It is impolite to turn your back on someone who [that] is speaking to you. 人家跟你说话，你把背朝人是不礼貌的。 2. 但是在下列情况，通常要用that： ①当先行词是一个既指人又指物的并列词组时： I made a speech on the men and things that I had seen abroad. 我就我在国外所见到的人和事作了报告。 ②当先行词是who时(为避免重复)： Who was it that won the World Cup in 1982? 谁赢得了1982年的世界杯？ ③当关系代词在定语从句中作表语时(可省略)： Tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了。 3. 但是在下列情况，通常要用who： 当先行词为those 且指人时，英语习惯上要用who 来引导定语从句。如： Those who do not wish to go need not go. 不愿去的人不需要去。 Those who couldn’t walk were carried on stretchers. 那些不能走的人都用担架抬着。 It is said that those who eat the most are the least healthy. 据说吃得最多的人身体最差。 Only those who had booked in advance were allowed in. 只有那些预先订票的人可以进去。 The plan was supported by those who wished to listen to more good English. 这计划受到想多听好英语的人的支持。 Let us spend a few moments in silence so that / in order that we remember those who died to preserve our freedom. 让我们默哀片刻，以缅怀那些为维护我们的自由而牺牲了的人们。 注：偶尔也可见到在 who 之后用that 引导定语从句的用例，但相当少见。如： The danger is that people who pay their bills on time will be lumped in with those that don’t. 危险的是那些及时付账的人将会同那些不及时付账的人混在一起。

as引导定语从句的用法

as引导定语从句的用法 as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which 引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思 (1) As is known to all, China is a developing country. (2) He is from the south, as we can see from his accent. (3) John, as you know, is a famous writer. (4) He has been to Paris more than several times, which I don’t believe. ================================ As 的用法例 1. the same…as；such…as 中的as 是一种固定结构, 和……一样……。 I have got into the same trouble as he (has). 例2. as可引导非限制性从句，常带有'正如'。 As we know, smoking is harmful to one's health. As is known, smoking is harmful to one's health. As是关系代词。例1中的as作know的宾语； 例2中，它充当从句的主语，谓语动词know要用被动式。 一、“as / which”特殊定语从句的先行成分 1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分，如： My grandmother’s house was a lways of great importance to me, as my own is. 在一定的语言环境里，有些名词可以具有形容词的性质。这些名词主要是那些表示人的身份、职业、状态的名词。值得一提的是，在这些具有形容词性质的名词之后，引导定语从句的关系代词不能用who / whom. 2. 动词短语先行成分。 这种动词短语既可是限定形式也可是非限定形式。如果是动态动词短语，它们在从句中就一般有限定或非限定形式的替代动词do和as / which一起代替。do可以出现，也可以不出现，但不能用其它动词代替。 3. 句子作先行成分。 这句子可以是整个主句也可以只是主句中的一个从句。有时是连续几个句子，有时甚至可以是一个完整的故事。 二、“as/which”特殊定语从句在句中的位置 由于先行成分的构成成分不同，“as/which”特殊定语从句在句中的位置有以下几种情况：1. 形容词做先行成分时：形容词或形容词短语（含具有形容词性质的名词）作先行成分，“as / which”特殊定语从句置于先行成分之后。 2. 动词短语作先行成分时：动词短语作先行成分时，“as / which”特殊定语从句置于先行成分之后。但是，当从句中含有表示主观意志的插入成分时，“as”特殊定语从句可以移至句子之首。 3. 句子作先行成分时：“as”特殊定语从句的位置较灵活，可以置于先行成分之前、之中或之后。但如果先行成分是直接引语，“as”特殊定语从句多在先行成分之前。如果先行成分是否定句，“as”特殊定语从句与否定词的相对位置不同可以使它产生不同的意义。由于“as”特殊定语从句具有这一特点，所以有时它的位置不能随便移动。在非正式的文体里，“which”特殊定语从句可以出现在先行成分之中。

初中英语语法 whowhich和that引导的定语从句

初中英语语法who which和that引导的定语从句 初中英语语法who, which和that引导的定语从句 【链接中考】 ( ) 1. Is that the man ______ helped us a lot after the earthquake? (2009浙江杭州) A. whose B. which C. when D. who ( ) 2. Sorry, we don’t have the c oat ______ you need. (2009河北) A. what B. who C. whom D. which ( ) 3. I’ve found some pictures of the most interesting places _______ you can visit during the winter holidays. (2009山东烟台) A. where B. which C. what D. that 【概念】在复合句中作定语的从句叫定语从句。 先行词：被定语从句修饰的名词或代词称为先行词。 关系词：引导定语从句的词叫关系词，也叫引导词。关系词包括关系代词和关系副词。关系代词有that, which, who, whom, whose等，关系副词有where, when, why等。 【关系代词的功能】 关系代词在从句中的功能 that 作主语或宾语(指人或物) which 作主语或宾语(指物，可与that互换) who 作主语或宾语(指人，可与that互换) 【温馨提示】 ◆that和which在从句中作宾语时常可省略。 ◆以下情况的定语从句常用that引导而不用which： (1) 先行词是不定代词all, few, little, much, everything, nothing, anything等时; (2) 先行词被形容词最高级修饰时; (3) 先行词被序数词修饰时; (4) 先行词被the very, the only, the last等修饰时; (5) 先行词被all, every, any, little, no等修饰时; (6) 先行词既有人又有物时。 ◆先行词在从句中作介词的宾语且介词前置时，只能用which或whom引导。 【语法闯关】用适当的关系代词填空。 1. I prefer shoes ______ are cool. 2. My necklace is not the only thing ________ is missing. 3. These are the best stamps _______ Kate has given me. 4. The building in ______ you live is comfortable. 5. —Is everything ______ we need to do done? —Yes. You needn’t worry about it. 6. The man ______ stands over there is my Chinese teacher. 7. I want to read all the books ______ were written by Guo Jingming. 8. The book ______ has a red cover is a storybook. Key： 【链接中考】1-3 DDD 【语法闯关】

than引导定语从句

As、but和than通常都是以介词、连词等身份被大家所熟知，而它们居然可以摇身一变成为关系代词，在定语从句中做主语和宾语。As As最基本的用法是做连词“与……一样”表示同级的比较，介词“作为”。下面是它特殊的用法， 例句：1. He does not possess such qualifications as are necessary to be an actor. 他并不具备一名演员应有的资格。2. She bought the same skirt as I had bought last week so I need to talk to her about it so we don't wear them the same at the same time. 她买的那条裙子和我上周买的一模一样，我要和她商量一下，免得“撞衫”。上面两个例句中定语从句都使用了as作为关系代词，我们可以发现例句1中含有“such…as…”，例句2中含有“the same…as…”，由此可见，我们到底要不要使用as来做关系代词，可以根据句中是否出现了与as搭配的短语进行判断。3. The murderer who had killed several people on the campus was finally arrested by the police, as was expected. 如我们所愿，那个在校园杀害数人的杀人犯终于被警方逮捕。该句中并未出现与as搭配的短语，此处的用法是as做关系代词指代前面整个句子，在定语从句中做主语。 But大家熟悉的but基本都是以转折连词的身份出现，但是它还兼职在做定语从句中的关系代词。例句：There is no man but errs. 没有任何人能够不犯错误。句中的先行词是man，but 自然就充当了关系代词的角色，但我们从句意中可以发现，but带有一层否定的意思，相当于“who not”。那么我们可以把例句转换为：There is no man who does not err. 但要注意，只有在but 前有先行词的时候才有此用法！请比较下面这个例句：He did nothing after graduation but spend his parents' money. 他毕业之后无所事事，就知道花爸妈的钱。该句中but 是介词的用法，有转折的意义。 Than即可以做连词也可以做介词的than都是比较的含义，它居然也可以用在定语从句中。例句：1. Parents had better not give kids more money than is needed. 父母最好别给孩子们太多的钱，够用就可以了。2. Don't order more food than can be finished. 别点太多吃的，会吃不完的。此处Than以主语的形式出现在定语从句中，其实省略了what，than也就等于than what。例句也可以写作：Parents had better not give kids more money than what is needed 例句2则可以转换为：Don't order more food than what can be finished 不管是做介词、连词也好，在定语从句里做关系代词也罢，than都表示了一个比较的关系，从上述两个例句来看，句中都出现了比较级的形式。 一、but可被看作关系代词，引导定语从句，在句中作主语，在意义上相当于who not或that not，即用在否定词或具有否定意义的词后，构成双重否定。 如：①There is no mother but loves her children．没有不爱自己孩子的母亲。 ②There was no one present but knew the story already．在场的人都知道这个故事。 二、than作关系代词时，一般用在形式为比较级的复合句中，其结构为形容词比较级（more）．．．than＋从句，than在从句中作主语，相当于that，代表它前面的先行词。（这时，它兼有连词和代词的性质，也有学者认为这种用法的than是连词，后面省略了主语what。） 如：①The indoor swimming pool seems to be a great deal more luxious than is necessary．室内游泳池过于豪华。 ②He got more money than was wanted．他得到了更多的钱。

who是什么从句

关系代词who引导定语从句作句子的主语、宾语。定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导。 who的用法 1.who引导的定语从句的先行词是表示人的名词或代词。例如： （1）The student who is answering the question is John. 正在回答问题的那个学生是约翰。 （2）Anybody who breaks the laws will be punished. 任何违反法律的人都将受到惩罚。 2.who是主格，在定语从句中作主语，此时不能省略。例如： （1）The person who was here yesterday is a musician. 昨天来这儿的那个人是位音乐家。 在非正式英语中，who亦可作宾语，且可以省略。例如： （2）The man（who）I saw just now is Mr Li.我刚才见到的那个人是李先生。 3.在定语从句中，who在人称、数上和其前面的先行词保持一致。如： Do you know the boy who is standing over there? 你认识站在那边的那个男孩吗？ 4.若先行词中既有人又有物，关系代词用that而不用who。例如： He watched the children and boxes that filled the car. 他看见了塞满汽车的孩子和箱子。

5.若先行词前面有形容词最高级、序数词修饰，关系代词用that而不用who。例如： （1）Yao Ming is the best basketball player that I know. 姚明是我知道的最好的篮球运动员。 （2）Tom is the first boy that left the room. 汤姆是第一个离开这个房间的男孩。

when,where,why引导的定语从句

when，where，why引导的定语从句 when，where，why作为定语从句的引导词，总称为关系副词。下面用句子合并的方法分析它们的使用。 一、where引导的定语从句 请分析下面两个简单句： 句①I know a garden. 句②You can find wild strawberries there. 把句②变为句①的定语从句，句①中的agarden做定语从句的先行词。在句②中there指句①中提到的agarden也就是定语从句的先行词，there在句中做地点状语，因此要用where 引导定语从句，代替句②中的there，也就是说there就不能出现在定语从句中了。由此得到句③I know a garden where you can find wild strawberries. 句②还可以写作句④You can find wild strawberries in it(it指句①中的garden，“在花园中”要使用介词短语in the garden)。把句④变为句①的定语从句，因为it做介词in 的宾语，先行词是agarden，指物。在这种定语从句中介词常常提到定语从句的开始，这时关系代词只能使用which替代it，it就不能在定语从句中出现了。由此得到句⑤即：I know a garden in which you can find wild strawberries. 请把下面每组的两句话合并为一句，把第二句话变为第一句的定语从句。 第一组： This is the village. I was born there. →This is the village where I was born. 第二组： The lab is not far from here. The chemist often does experiments there. →The lab where the chemist often does experiments is not far from here.

介词引导的定语从句 -答案

介词+关系代词引导的定语从句 “介词+关系代词”引导的定语从句是定语从句的一种复杂形式，这类定语从句的关系代词主要有which ,whom , whose , 它们既可以引导限定性定语从句，也可以引导非限定性定语从句。关系代词前该选用什么样的介词，要根据不同的语境、习语、惯用法等来决定。一．介词选择的主要标准 1.介词与定语从句的先行词是一种习惯性搭配 Human facial expressions differ from those animals in the degree to which they can be controlled on purpose.人类的面部表情和动物的面部表情就可控制的程度来说是不一样的。( to a degree ) The English play in which my students acted at the New Year’s party was a great success.那场在新年晚会上我学生参加表演的英语剧很成功。( in the play ) The schools themselves admit that not all children will be successful in the jobs for which they are being trained.学校本身承认，并不是所有的孩子都能在他们所接受的培训的职业成功。( be trained for the job ) 2.介词与定语从句中的动词是一种习惯性搭配 Who is the man with whom our teacher is shaking hands? 我们的老师与之握手的那个男士是谁？( shake hands with sb. ) Last month , part of Southeast Asia was struck by floods , from whose effects the people are still suffering. 上个月，东南亚的部分地区发生洪水，人们还在遭受着洪水所带来的影响。(suffer from sth. ) 3.介词与定语从句中的形容词构成一种习惯性的搭配 Ours is a beautiful country , of which we are greatly proud . 我们的国家是一个美丽的国家，我们为之感到很自豪。( be proud of ) The woman to whom Spielberg is married is an actress. 同斯皮尔伯格结婚的女人是一位演员。( be married to ) The woman to whom he was engaged was a doctor. 他与之订婚的那个女士是位医生。(be engaged to ) 4.有时关系代词前用什么介词，要根据句子的意思来决定，此时不但要注意其前的搭配，也要注意其后的搭配 I was a woman running toward me in the dark. Before I could recognize who she was, she had run back in the dark.Before I could recognize who she was , she had ran back in the direction from which she had come.看见一位妇女在黑暗中像我走来，我还没来得及认清她是谁，她已经从她来的方向跑回去了。（如果仅注意先行词，很容易受习惯心里的影响而使用in this direction 的搭配，但考虑到语境后的come ，则应该使用from。） He was educated at the local high school, after which he went on to Beijing University. 他在当地一所高中上学，之后他上了北京大学。（after which 的意思就是“在当地一所高中接受完教育之后”）。 In the office I never seem to have time until after 5:30 pm. by which time many have got home.在 办公室我好像总是没时间，只有等到下午五点半，而那个时候大家都已经回家了。（此句不能受at 5:30 pm 的通常表达的影响而选用介词at, 而应该依据整个句子的语意来确定介词。）5.表示“所有格”或“整体与部分关系”时，用介词of The journey around the world took the old sailor nine months, of which the sailing time was 226 days.这次环球旅行老水手用了9个月，其中航行的时间是226天。 The factory produces half a million pairs of shoes every year, 80% of which are sold abroad. 这个工厂每年生产50万双鞋，其中的（指50万双鞋）80%销往海外。 I was told that there were about 50 foreign students studying Chinese in the school, most of whom

who, which引导的定语从句

who, which引导的定语从句 在复合句中，修饰某一名词或代词的从句叫定语从句。它的作用相当于一个形容词。定语从句通常位于它所修饰的名词或代词之后，这一名词或代词叫先行词，引导定语从句的关联词为关系代词（副词）。这里主要介绍关系代词who与which的用法。 关系代词who（whom）和which均可引导定语从句，who用来指人，而which指物，在从句中充当主语或宾语。请看例句： We shall never forget Mr Li who taught us English in the middle school. 我们永远不会忘记中学时教我们英语的李老师。(who在从句中作主语) The man who(m) you saw last week has left the town. 上周你看见的那个人已离开这个城镇了。（whom也可用who, 在从句中作saw的宾语）【温馨提示】关系代词在从句中作宾语时，常可省略。如： He told a story which moved us deeply. 他讲了一个使我们深受感动的故事。（which在从句中作主语） This is a reason which we must not forget. 这是 （which在从句中作宾语）我们不能忘记的一个原因。

需要指出的是关系代词which和that都可指物，一般情况下可以互换。如： The house which / that you lived in is a very old building. 你住的那个房子是座古老的建筑。 但在下列情况中，通常用which, 不用that。 当先行词有指示代词修饰时。如： The lady did not want that one which smelt terrible. 那位夫人不要气味难闻的那个。 当关系代词前有介词时。如： The room in which my family live used to be a garage.我家住的房间以前是个车库。 当先行词本身为that时。如： That which you told him about is what we want to know. 你告诉他的正是我们想知道的。

过去进行时、when和while引导时 间状语从句的区别

过去进行时过去进行时表示过去某一时刻或者某段时间正在进行或发生的动作，常和表过去的时间状语连用，如： 1. I was doing my homework at this time yesterday. 昨天的这个时候我正在做作业。 2. They were waiting for you yesterday. 他们昨天一直在等你。 3. He was cooking in the kitchen at 12 o'clock yesterday. 昨天12点，他正在厨房烧饭。 过去进行时的构成： 肯定形式：主语+was/were+V-ing 否定形式：主语+was not (wasn't)/were not (weren't)+V-ing 疑问形式：Was/Were+主语+V-ing。 基本用法： 1. 过去进行时表示过去某一段时间或某一时刻正在进行的动作。常与之连用的时间状语有，at that time/moment, (at) this time yesterday (last night/Sunday/week…), at+点钟+yesterday (last night / Sunday…)，when sb. did sth.等时间状语从句，如： 1）What were you doing at 7p.m. yesterday? 昨天晚上七点你在干什么？ 2）I first met Mary three years ago. She was working at a radio shop at the time. 我第一次遇到玛丽是在三年前，当时她在一家无线电商店工作。 3）I was cooking when she knocked at the door. 她敲门时我正在做饭。 2. when后通常用表示暂短性动词，while后通常用表示持续性动词，而while所引导的状语从句中，谓语动词常用进行时态，如： When the car exploded I was walking past it. = While I was walking past the car it exploded. 3. when用作并列连词时，主句常用进行时态，从句则用一般过去时，表示主句动作发生的过程中，另一个意想不到的动作发生了。如： I was walking in the street when someone called me. 我正在街上走时突然有人喊我。 4. when作并列连词，表示“（这时）突然”之意时，第一个并列分句用过去进行时，when引导的并列分句用一般过去时。如：