一．主语从句
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1. It 作形式主语和it引导强调句的比较
It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。例如：It is a pity that you didn’t go to see the film. It doesn’t inte rest me whether you succeed or not. It is in the morning that the murder took place. It is John that broke the window.
2. 用it 作形式主语的结构
(1) It is ＋名词＋从句It is a fact that … 事实是… It is an honor that …非常荣幸It is common knowledge that …是常识(2) it is ＋形容词＋从句I t is natural that… 很自然… It is strange that… 奇怪的是… (3) it is ＋不及物动词＋从句It seems that… 似乎… It happened that… 碰巧… (4) it ＋过去分词＋从句It is reported that… 据报道… It has been proved that… 已证实…
3. 主语从句不可位于句首的五种情况
(1) if 引导的主语从句不可居于复合句句首。(2) It is said , (reported) …结构中的主语从句不可提前。例如：It is said that President Jingo will visit our school next week. (right) That President Jiang will visit our school next week is said. (wrong) (3) It happens…, It occurs… 结构中的主语从句不可提前。例如：It occurred to him that he failed in the examination. (right) That he failed in the examination occurred to him. (wrong) (4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：It doesn’t matter whether he is wrong or not. (right) Whether he is wrong or not doesn’t matter. (wrong) (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：Is it likely that it will rain in the evening? (right) Is that will rain in the evening likely? (wrong)
4. What 与that 在引导主语从句时的区别
What 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：1) What you said yesterday is right. 2) That she is still alive is a consolation.
二、定语从句
定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，定语从句分为限定性和非限定性从句两种。
（一）限定性定语从句
1. that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置
2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢
3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括all, anything, much等，这时的that常被省略
4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语
5. where是关系副词，用来表示地点的定语从句
6. when引导定语从句表示时间［注］值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导 By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to business trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc.
7. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格
8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时，常用there is来引导
（二）非限定性定语从句：
非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分
2. 在引导限定性定语从句时，that有时相当于in which, at which, for which或at which Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。 I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐，而他恰恰与我相反。 We arrived the day that(on which) they left. 刚好我们到的那天他们走了。
3. 有时as也可用作关系代词
4. 在非限定性定语从句中，不能用that，而用who, whom代表人，用which代表事物.
定语从句及相关术语
1.定语从句：修饰一个名词或代词的从句称为定语从句，一般紧跟在它所修饰的先行词后面。
2.关系词：引导定语从句的关联词成为关系词关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等；关系副词有where, when, why等。关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。
二.关系代词引导的定语从句
1.who指人，在从句中做主语(1) The boys who are playing football are from Class One.(2) Yesterday I helped an old man who lost his way.
2. whom指人，在定语从句中充当宾语，常可省略。(1) Mr. Liu is the person (whom) you talked about on the bus.(2) Mr. Ling is just the boy whom I want to see.注意：关系代词whom在口语和非正式语体中常用who代替，可省略。(3) The man who/whom you met just now is my friend.
3. which指物，在定语从句中做主语或者宾语，做宾语时可省略(1) Football is a game which is liked by most boys.(2) This is the pen (which) he bought yesterday. 如果在从句中做宾语,就用whom或who.比如: He is the man whom/who I talk to. 如果是在从句中作主语就只能用who.比如: He is the man who has an English book.
4. that指人时，相当于who或者whom；指物时，相当于which。在定语从句中做主语或者宾语，做宾语时可省略。(5) The number of the people that/who come to visit the city each year rises one million.(6) Where is the man that/whom I saw this morning?
5. whose通常指人，也可指物，在定语从句中做定语(1) He has a friend whose father is a doctor.(2) I once lived in a house whose roof has fallen in.whose指物时，常用以下结构来代替
(3) The classroom whose door is broken will soon be repaired.(4) The classroom the door of which is broken will soon be repaired.(5) Do you like the book whose cover is yellow?(6) Do you like the book the color of which is yellow?
三.介词+关系代词引导的定语从句
关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导(1) The school (that/which) he once studied in is very famous.(2) The school in which he once studied is very famous.(3) Tomorrow I will bring here a magazine (that/which) you asked for.(4) Tomorrow I will bring here a magazine for which you asked.(5) We’ll go to hear the famous singer (whom/that/who) we have often talked about.(6) We’ll go to hear the famous singer about whom we have often talked.注意：
1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等(1) This is the watch which/that I am looking for. (T)(2) This is the watch for which I am looking. (F)
2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose(1) The man with whom you talked is my friend. (T)(2) The man who/that you talked with is my friend. (F) (3) The plane in which we flew to Canada is very comfortable. (T)(4) The plane in that we flew in to Canada is very comfortable. (F)
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词(1) He loved his parents deeply, both of whom are very kind to him.(2) In the basket there are quite many apples, some of which have gone bad.(3) There are forty students in our class in all, most of whom are from big cities.
四．关系副词引导的定语从句
1. when指时间，在定语从句中做时间状语(1) I still remember the day when I first came to the school.(2) The time when we got together finally came.、
2. where指地点，在定语从句中做地点状语(1) Shanghai is the city where I was born.(2) The house where I lived ten years ago has been pulled down.
3. why指原因，在定语从句中做原因状语(1) Please tell me the reason why you missed the plane.(2) I don’t know the reason why he looks unhappy today.注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换(1) The reason why/ for which he refused the invitation is not clear,(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.(3) Great changes have taken place in the city in which./where I was born.
定语从句与强调句的比较
定语从句是由关系代词和关系副词引导的从句，其作用是作定语修饰主句的某个成分，定语从句分为限定性和非限定性从句两种。状语从句分为时间状语从句，结果状语从句，让步状语从句，原因状语从句，条件状语从句以及行为方式状语从句。名词从句包括主语从句，宾语从句，表语从句和同位语从句及there be句型。
一、限定性定语从句
1. that即可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，which在从句中作宾语则不能省略。而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置
2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢
3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括all, anything, much等，这时的that常被省略
4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它可以作动词的宾语也可以作介词的宾语
5. where是关系副词，用来表示地点的定语从句
6. when引导定语从句表示时间
〔注〕值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导
By the time you arrive in London, we will have stayed there for two weeks.
I still remember the first time I met her.
Each time he goes to besiness trip, he brings a lot of living necessities, such as towers, soap, toothbrush etc.
7. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格
8. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时，常用there is来引导
二、非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立
1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分
2. 在引导限定性定语从句时，that有时相当于in which, at which, for which或at which
Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。
I like the music for the very reason that(for which) he dislike it. 我出于某种原因喜欢这种音乐，而他恰恰与我相反。
We arrived the day that(on which) they left. 刚好我们到的那天他们走了。
3. 有时as也可用作关系代词
4. 在非限定性定语从句中，不能用that，而用who, whom代表人，用which代表事物
常考的强调句结构是it 引导的句子。
It is (was) 被强调部分+ that (who) + 句子其他部分。
此结构强调的成分仅限于主语，宾语和状语。
It is from the sun that we get light and heat.
It was not until I had read your letter that I understood the true state of affairs.
典型例题
1）It was last night ___ I see the comet.
A. the time
B. when
C. that
D. which
答案C. 强调句的结构是：It +be +强调部分+ that (who) + 主谓句。强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用"who"，其余用that。
原句：My father did the experiment in the lab yesterday evening.
强调主语：It was my father who did the experiment in the lab yesterday evening.
强调宾语：It was the experiment that my father did in the lab yesterday evening.
强调时间：It was yesterday evening that my father did the experiment in the lab. (注意不用when)
强调地点：It was in the lab that my father did the experiment yesterday evening.
2）It is ten years ___ Miss Green returned to Canada.
A. that
B. when
C. since
D. as
答案C. 考点是连词用法。本题易误选为A. that. 其实本句不是强调句。若是，去掉It be… that还应是一个完整的句子。而本句去掉'It is…that'，只剩下ten years Miss Green returned to Canada. 不成句。因此本句不是强调句。
It is /was +时间+ since… 其中is<---> has been was <---> had been.
定语从句 1. After living in Australia for many years, Louise finally returned to the country she was born. 2. There are many good websites you can check out the latest in the science world. 3.Another saying which has come from the fable is "God helps those help themselves”. 4. Then Needham began his lifelong research, ended up creating the greatest work--Science and Civilization in China. 5. His interest started a few years ago, he was in college and studying wildlife science. 6. There are perhaps 40 million competitive table tennis players and many ordinary people play less seriously. 7. He was a great scientist and extraordinary man work and legacy will live on for many years. 8. That is an Oxford college, famous graduates include the late Benazir Bhutto. 9. But it's not like many other countries there seems to be tension among the different cultures. 10. Then, a fire, broke out in 1969 on Cleveland's Cuyahoga River, shed light on the problem of chemical pollution in water. 11. Pupils, usually come from the fifth or sixth grade, are
.在there + be 的句型中，句子的主语是先行词，而且又是物。例如： There are two novels that I want to read. 我要读的有两本小说。 There is no work that can be done now. 没有什么工作现在能做的了。 2.当先行词为主句的表语或者关系代词为从句的表语时。例如： This is the book that was bought yesterday.这就是昨天买的书。 Our school is no longer the school that it used to be. 我们的学校不再是以前的学校了。 3.以Here is (are)开头的句子时。例如： Here is a film that will move anyone.这是一部将使任何人受感动的电影。Here are two books that I will buy.这是我要买的两本书。 4.It is (high)time +定语从句中。例如： It is time that we should have a rest.我们应该休息了。 It is high time that they started out. 他们该动身了。 5.当先行词是way等词时，关系代词用that或者in which在定语从句中作方式状语时，在口语中，常可省略。例如： This is the way that my father did this work.这就是我父亲做此工作的方式。 She admired the way in which I answered the questions. 她羡慕我回答问题的方式。 6.在双重限定性定语从句中，如果一个从句用who或者which引导时，那么另一个从句用that引导。例如： He is the student that I have ever see who can jump highest.他是我曾经看到过跳得最高的学生。 My brother studies in the school which is the most beautiful in our city that isn’t far from here. 我的弟弟在我们的城市最美丽的学校读书，并且离这儿不远。 7.当先行词被the last , the very 和the only修饰时。例如： This is the very pen that I am looking for. 这正是我找的钢笔。 The only book I want to read is missing. 我唯一想看的书不见了。 8.在强调句子中，并且以who ,which, what开头时。例如： Who was it that was lost ? 究竟是谁迷路了？（此句中，最好不用who来代替that，避免重复。） What was it that you did last week? 你上周究竟做什么了？ 9.当先行词有序数词时。例如： You are the first person that I want to ask for.你是我要见的第一个人。This is the second book that I have ever written.这是我写的第二本书。 10.当先行词被all, every, no , some, few , little, much, both等修饰时，例如： This is all that I want to say at the meeting.这就是我在会上要说的。Have you any books that are worth reading? 你有值的看的书吗？ 11.当先行词既指人又指物时。例如： The professor and his achievement that I heard about are admired by them .
表语从句与主语从句 表语从句和主语从句以及宾语从句都要用陈述语序。 Ⅰ.表语从句 在复合句中，位于系动词之后作表语的从句称为表语从句。它位于主句的系动词之后， 最为重要的是我们应该为牛找到足够的水。 The doubt is who has taken away the valuable vase. （主语，人） 疑点是谁拿走了那只贵重的花瓶。 My topic today is what most scientists are researching.（宾语，物，没有选择范围） 我今天的话题就是大多数科学家正在研究的课题。 The problem is which school will be chosen.(which在从句中作定语) 问题是哪一所学校将被选中。 All this was over twenty years ago，but it’s as if it was only yesterday. 这都是20多年前的事了，但宛如昨天一样。 表语从句中应注意的问题 (1)because，why引导的表语从句。 because引导表语从句时，表示“因为”，why引导表语从句时，表示“……的原因”，相当于the reason why。 That’s because he didn’t understand me. (That’s because...强调原因) 那是因为他不理解我。 That’s why he got angry with me. (That’s why...强调结果) 那正是他对我生气的原因。 (2)what引导的主语从句表示结果或名词reason作主语时，后面的表语从句表示原因时要用that引导，不宜用because。 What cost him his life was that he was too careless. 使他丧命的原因是他太粗心了。 The reason why I was sad/for my being sad was that he didn’t understand me. 我难过的原因是他不理解我。 (3)使用虚拟语气的表语从句 在表示建议、劝告、命令含义的名词后的表语从句中，谓语动词需用“should＋动词原形”表示，should可省略。常见的词有：advice，suggestion，order，proposal，plan，idea，request，requirement等。 My suggestion is that we (should) have a discussion about this matter instead of just laying it aside. 我的建议是我们应当讨论一下这个问题，而不应该把它放在一边。 （4）as if/as though引导的表语从句常置于系动词look，seem，sound，be，become等后面，常用虚拟语气，即形式常用过去式的某种时态。
定语从句中关系词省略的6种情形 欧阳光明（2021.03.07） 关系词有时可以省略，但这只限于限制性定语从句中，在非限制性定语从句中，关系词则不可省略。 一、关系代词作宾语时的省略 当关系代词who, whom, which和that在定语从句中用作动词宾语或介词位于句末时的介词宾语时，可以省略。如： Is there anything (which) you wanted? 想要什么东西吗? Who is the man (that / who / whom) you were talking to? 刚才和你讲话的人是谁? 二、关系代词作表语时的省略 当关系代词that在定语从句中用作表语时，可以省略。如： China is not the country (that) it was. 中国已不是过去的中国了。(that作表语) 三、关系代词作宾补时的省略 当关系代词that在定语从句中用作宾语补足时，可以省略。如： I’m not the madman (that) you thought me. 我并不是你所认为的那个疯子。(that作宾语补语) 四、关系副词when的省略 用作时间状语的关系副词when通常不能省略，但有一种特殊情况，即用于day, year, time等少数几个词后时可以省略(也可换成
that)。如： That was the year (that) I first went abroad. 就是那一年我第一次出国了。 I’ll never forget the day (that) we met. 我永远也忘不了我们见面的那一天。 五、关系副词where的省略 用作地点状语的关系副词where通常不能省略，但有一种特殊情况，即用于place, somewhere, anywhere, everywhere, nowhere少数几个词后时可以省略(也可换成that)。如： This is the place (where) they met yesterday. 这就是他们昨天碰头的地方。 Have you somewhere (that) I can lie down for an hour? 你有没有一个什么地方可以让我躺一个小时？ 六、关系副词why的省略 关系副词why通常只用于the reason后引导定语从句，且通常可换成that或for which，均可省略。如： That’s the reason (why, for which, that) he came. 这就是他来的原因。 Give me one reason (why) we should help you. 给我举出一个我们应当帮助你的理由
主语从句可以按其引导词的不同分为三类： 第一类,用从属连词that引导的主语从句,例如：That we shall be late is certain. That the driver could not control his car was obvious. 这种结构主要是对that从句的内容进行强调,属正式文体,连词that不可以省略；但是在一般情况下,往往使用先行it结构,即用it作形式主语,而把that从句放到后面,这时,在口语中,连词that 有时则可以省略.所以上述两句可以改为： It is certain that we shall be late. It was obvious that the driver could not control his car. 如果整个句子是疑问形式,就只能用先行it结构,例如： Is it true that he would take the risk?
Is it possible that they will come tomorrow? 常使用先行it结构,用that从句作主语的句子有下列几个句型： 1、It + be + 形容词+ that从句： It is clear that he was telling the truth. It’s probable that we’ll be a little late. 2、It + be + 名词词组+ that从句： It’s a pity that you can’t go with us. 3、It + 及物动词+ 宾语+ that从句： It worried her a bit that her hair was turning grey. It shocked me that Peter didn’t tell anybody where he was. 4、It + be + 过去分词+ that从句： It is said that he has been there many times. 5、It + seem/happen/appear等不及物动词+
定语从句中关系词省略的6种情形 关系词有时可以省略，但这只限于限制性定语从句中，在非限制性定语从句中，关系词则不可省略。 一、关系代词作宾语时的省略 当关系代词who, whom, which和that在定语从句中用作动词宾语或介词位于句末时的介词宾语时，可以省略。如： Is there anything (which) you wanted 想要什么东西吗 Who is the man (that / who / whom) you were talking to 刚才和你讲话的人是谁 二、关系代词作表语时的省略 当关系代词that在定语从句中用作表语时，可以省略。如： China is not the country (that) it was. 中国已不是过去的中国了。(that作表语) 三、关系代词作宾补时的省略 当关系代词that在定语从句中用作宾语补足时，可以省略。如： I’m not the madman (that) you thought me. 我并不是你所认为的那个疯子。(that作宾语补语) 四、关系副词when的省略 用作时间状语的关系副词when通常不能省略，但有一种特殊情况，即用于day, year, time等少数几个词后时可以省略(也可换成that)。如： That was the year (that) I first went abroad. 就是那一年我第一次出国了。 I’ll never forget the day (that) we met. 我永远也忘不了我们见面的那一天。 五、关系副词where的省略 用作地点状语的关系副词where通常不能省略，但有一种特殊情况，即用于place, somewhere, anywhere, everywhere, nowhere少数几个词后时可以省略(也可换成that)。如： This is the place (where) they met yesterday. 这就是他们昨天碰头的地方。 Have you somewhere (that) I can lie down for an hour 你有没有一个什么地方可以让我躺一个小时 六、关系副词why的省略 关系副词why通常只用于the reason后引导定语从句，且通常可换成that 或for which，均可省略。如： That’s the reason (why, for which, that) he came. 这就是他来的原因。 Give me one reason (why) we should help you. 给我举出一个我们应当帮助你的理由
主语从句 一定义：在中充当成分的句子叫做主语从句。 二主语充当主语的句子类型： 1.常规从句，即句子在中充当一个；从句的不受主句的时态影响和限制。 （1）That he finished writing the composition in such a short time surprised us all. （2）Whether we will go for an outing tomorrow remains unknown. （3）Who will be our monitor hasn't been decided yet. （4）Whom we must study for is a question of great importance. （5）What caused the accident remains unknown. （6）Whatever you did is right. （7）Who the watch belongs to is unknown. （8）What we need is time. （9）What we need are good doctors. 小结: （1）引导从句有that,whether,who,what,whatever等； （2）位于句首不能省略； （3）从句大多数情况下视为，但也有例外，如例（9） 注意：当what引导的名词性分句作主语时，问题极为复杂。 2. 为了防止句子，通常把it放在句首位置，真正主语搁置于句末 （1）It is certain that he will win the match.
THAT什么时候可以省略? 标签：省略is语法 回答：2 浏览：3247 提问时间：2007-06-02 12:29 The reason for that is that ................. 如果语法没错的话,那么THAT可以去掉么? 推荐资料:化学版青花瓷.mp3 更多"青花瓷"相关资料>> 最佳答案此答案由提问者自己选择，并不代表爱问知识人的观点 揪错┆评论 有来无回 [文曲星] 宾语从句中that一般情况可省,但也并不是任何情况下都可以省略。 具体如下： 宾语从句 1．定义：用作宾语的从句叫宾语从句。 2．构成：关联词+简单句 从属连词that。如： He told us that he felt ill. 他对我们说他感到不舒服。 I know he has returned. 我知道他已经回来了。(that省略) 注:宾语从句中that一般情况可省,但that在引导宾语从句时也并不是任何情况下都可以省略。在以下情况下，that不能省略。 1．Everybody could see what happened and that Tom was frightened.(and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。) 大家都会看出所发生的事情并知道Tom非常害怕。 2．I know nothing about him except that he is from the south.(that引导的宾语从句作介词宾语时，that 不能省略。)
对他我一无所知，只知道他是南方人。 3．That he ever said such a thing I simply don’t believe. (that从句位于句首时，that不可省略。) 我简直不相信他曾说过这样的话。 4．We decided, in view of his special circumstances, that we would admit him for a probationary perio d. (主句谓语动词与that从句之间有插入语，that不可省略。) []打印 关系词有时可以省略，但这只限于限制性定语从句中，在非限制性定语从
定语从句中关系代词的省略与保留 定语从句中关系代词的省略与保留的几种情况 我们知道，关系代词在定语从句中作宾语时可以省略，但也有几种特殊情况，关系代词不用作宾语也可以省略，同学们学习和使用时请注意。 在下列情况下,引导宾语从句的关联词可以省略。 一、that在定语从句中作表语时。例如: She is all (that) a teacher should be. 她具备一个老师应该具备的所有条件。 二、that在从句中作补语时。例如: I'm not the fool(that) you thought me. 我不是你以前所认为的那个傻子了。 He is the nicest teacher (that) the students consider him in their school. 他就是学生认为学校中最好的那个老师。 三、作状语时的省略。 1. 当先行词是reason,且在定语从句中作原因状语时,可以用关系副词why或关系代词that,也可以省略。例如: The reason (why/that) he failed was his laziness. 他失败的原因是因为他懒惰。 That is the reason I did it. 那就是我做那件事的原因。 2. 当先行词是way,且在定语从句中作方式状语时,关联词可用in which或that,也可以省略。例如: The way(in which/ that) these comrades look at problems is wrong.这些同志看待问题的方式是错误的。 That was the way(in which / that) she worked the problem out. 她就是用那种办法解决问题的。 3. 当先行词是time时,关联词可用when, that或省略。例如: The second time (that) I saw him was in 2000. 我第二次见到他是在2000年。 I don't know the exact time (when/ that) the sports meeting will take place. 我不知道运动会举办的确切时间。 4.当先行词是place时,关联词可用where,that或省略。例如: The place(where/ that) we will have our picnic is not decided yet. 我们举行野餐的地点还没定下来。 This is the right place he was born.这儿就是他的出生地。(注意:句末不可用介词in) 同学们往往认为关系代词作宾语时就一定可以省略,其实不然.在下列四种情况下,关系代词虽作宾语,却不能省略。 一、在介词+whom /which结构中, whom, which不能省略。例如: Do you know any shops nearby in which I can buy flowers?你知道附近有可以买到花的商店吗?
主语从句 （一）主语从句的标记主语从句通常由连词that和whether (if)、连接代词或连接副词以及关系代词型what引导。 1. that引导 That he is still alive is a wonder. 他还活着，真是奇迹。 That we shall be late is certain. 我们要晚了，这是确定无疑的。 That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。That she is still alive is a consolation. 她还活着是使人感到宽慰的。 That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。 That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。 That she was chosen made a tremendous stir in her village. 她被挑选上，在她村子里引起很大轰动。 2. whether引导 Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。 Whether they would support us was a problem. 他们是否会支持我们还是一个问题。 3. 连接代词引导 Whoever (=anyone who) fails to see this will make a big blunder. Whatever(=anything that) she did was reasonable. 无论什么 Anything that she did was reasonable. Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。Whichever(=anything that) you want is yours. 你要哪个哪个就是你的。 What do you need? What you need is a good rest. I don’t know what you need? 4. 连接副词引导 When we arrive doesn’t matter. 什么时候到没有关系。 When do we arrive? How it was done was a mystery. 这是怎样做的是一个谜。 How was it done? How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。 How did this happen? How many people we are to invite is still a question. 邀请多少人还是一个问题。How many people are we to invite? Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。 Where do i spend my summer? 5. 连接代词型what引导 What(=the thing that) we need is money. 我们需要的是钱。What do we need? What I want to know is this. 我想知道的就是这一点。What’s done is done. 事已成定局。 What=the thing that he says is not important. 他说的话并不重要。What does he say? What I am telling you is mere impressions. 我和你说的都不过是一些印象而已。What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。What you need is a good-sized canvas bag. 你需要的是一个比较大的帆布袋。 What I am afraid of is their taking him to Portugal. 我担心的是他们把他带到葡萄牙去。What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。（二）
定从中只用That不用which的情况 1.在there + be 的句型中，句子的主语是先行词，而且又是物。例如：There are two novels that I want to read.我要读的有两本小说。There is no work that can be done now. 没有什么工作现在能做的了。 2.先行词是最高级或被最高级修饰时 3.以Here is (are)开头的句子时。例如： Here is a film that will move anyone.这是一部将使任何人受感动的电影。 Here are two books that I will buy.这是我要买的两本书。 4.It is (high)time +定语从句中。例如： It is time that we should have a rest.我们应该休息了。 It is high time that they started out. 他们该动身了。 5.当先行词是way等词时，关系代词用that或者in which在定语从句中作方式状语时，在口语中，常可省略。例如： This is the way that my father did this work.这就是我父亲做此工作 的方式。 She admired the way in which I answered the questions.她羡慕我 回答问题的方式。 6.在双重限定性定语从句中，如果一个从句用who或者which引导时，那么另一个从句用that引导。例如： He is the student that I have ever see who can jump highest.他是我曾
只能用that 的情况： 1. 先行词为不定代词all, much, everything, nothing, none, the one 2. 先行词被only, any, few, little, no ,just, very, one of 修饰 3. 先行词被序数词或就是序数词时 4. 先行词是最高级 5. 先行词既是人又是物 6. 先行词是次数时two, ten, a hundred 7. 两从句一个已用which ，另一个用that,避免重复 8. 疑问词是who/which,宜用that 9. 主句there be 10. 被修饰部分为表语or 关系代词本身是定从的表语时：主+be+n./adj. ; 主+系+adj. 只能用which 的情况： 1. 介词后 2. 非限制性定从 3. 当关系词后带插入语时 只能用who 的情况: 1. 先行词为anyone, anybody, those, all, one, ones, they, he, people 2. 非限制性定从 3. There be 先行词为way 时，定从常用that, in which, how, that. that 可省 As 的用法： 正如……As 是关系代词，代替整个句子，在后面的句子中充当动词know 的宾语。 He was a foreigner, as I know from his accent. 如为限制定从，多用于the same…as, such…as…, as many/much as, so as I have the same book as you (have). Her attitude to him was quite the same as it had always been. I live in the same house that he used to live in. I’m wearing the same shirt as you were yesterday. 非限制定从中，as 常至于句首。 As we all know, smoking is harmful to one’s health. as 做主语 as is well known (to us) as was mentioned before as could be expected as could be judged from her eyes as may be seen from the book as is recounted in his stories
定语从句中可以省略关系词的几种情况关系代词作宾语时的省略 当关系代词who, whom, which和that在定语从句中用作动词宾语或介词位于句末时的介词宾语时，可以省略。如： Is there anything (which) you wanted 想要什么东西吗 Who is the man (that / who / whom) you were talking to 刚才和你讲话的人是谁 关系代词作表语时的省略 当关系代词that在定语从句中用作表语时，可以省略。如： China is not the country (that) it was. 中国已不是过去的中国了。(that作表语) 关系副词when的省略 用作时间状语的关系副词when通常不能省略，但有一种特殊情况，即用于day, year, time 等少数几个词后时可以省略(也可换成that)。如： That was the year (that) I first went abroad. 就是那一年我第一次出国了。 I’ll never forget the day (that) we met. 我永远也忘不了我们见面的那一天。 关系副词where的省略 用作地点状语的关系副词where通常不能省略，但有一种特殊情况，即用于place, somewhere, anywhere, everywhere, nowhere少数几个词后时可以省略(也可换成that)。如： This is the place (where) they met yesterday. 这就是他们昨天碰头的地方。 Have you somewhere (that) I can lie down for an hour 你有没有一个什么地方可以让我躺一个小时
定语从句中可以省略关系词的几种情况 关系代词作宾语时的省略 当关系代词who, whom, which和that在定语从句中用作动词宾语或介词位于句末时的介词宾语时，可以省略。如： Is there anything (which) you wanted 想要什么东西吗 Who is the man (that / who / whom) you were talking to 刚才和你讲话的人是谁 关系代词作表语时的省略 当关系代词that在定语从句中用作表语时，可以省略。如： China is not the country (that) it was. 中国已不是过去的中国了。(that作表语) 关系副词when的省略 用作时间状语的关系副词when通常不能省略，但有一种特殊情况，即用于day, year, time等少数几个词后时可以省略(也可换成that)。如： That was the year (that) I first went abroad. 就是那一年我第一次出国了。 I’ll never forget the day (that) we met. 我永远也忘不了我们见面的那一天。 关系副词where的省略 用作地点状语的关系副词where通常不能省略，但有一种特殊情况，即用于place, somewhere,
anywhere, everywhere, nowhere少数几个词后时可以省略(也可换成that)。如： This is the place (where) they met yesterday. 这就是他们昨天碰头的地方。 Have you somewhere (that) I can lie down for an hour 你有没有一个什么地方可以让我躺一个小时 关系副词why的省略 关系副词why通常只用于the reason后引导定语从句，且通常可换成that或for which，均可省略。如： That’s the reason (why, for which, that) he came. 这就是他来的原因。
主语从句专练 I. 用适当的词填空，使句子意思完整。 1. ______ he didn’t attend the meeting yesterday wasn’t quite clear. 2. ______ team will win the match is still unknown. 3. ______ comes to the party will receive a present. 4. ______ Mary has left is still a question. 5. It’s reported ______ three people were killed in the accident and five were hurt badly. 6. ______ he solved the problem successfully interested all of us. 7. We usually think ______ we can’t get seems better than what we have. 8. It is a fact ______ English is being accepted as an international language. 9. ______ is to be sent there to solve the problem hasn’t been decided. II. 下列各句中均有一处错误，请改正。 1. That the old man’s son wanted to know was where the gold had been hidden. 2. It is reported when China has successfully sent Shenzhou VI spaceship into space. 3. If he can finish his task on time is of great importance. 4. Whether the 2008 Olympic Games will be held in Beijing excited the whole nation. 5. Whatever leaves the room last ought to turn off the lights. 6. Why they will solve the serious problem today has not been decided. 7. When will win the English competition is still a problem. 8. How our spring sports meet will be held or not this week is not known yet. 9. It’s strange when he should have gone away without telling us. III. 选择题 1.________ makes mistakes must correct them. A. What B. That C. Whoever D. Whatever 2. It worried her a bit ____ her hair was turning grey.
定语从句省略 1. 关系词充当从句的宾语的时候，可以直接省略，而从句不发生任何形式的改变。 This is the right book that you are looking for. = This is the right book you are looking for. 2. 关系词充当从句的主语时，如果谓语结构为实词，将关系代词进行省略，而从 句中的实词要发生形式的改变。如果原本从句是一个主动语态，可以将动词直接变成ing形式。如果原本谓语动词是一个被动语态，可以直接保留过去分词。 如Fruit that contains VC can relieve a cold.=Fruit containing VC can relieve a cold. 3.如果谓语结构为be+名词，这时，可以将be动词同时省略，将后面的名词和 前面从句所修饰的名词构成同位语结构。如I know Lucy who is the leader of the team.= I know Lucy, the leader of the team. 4. 3.先行词为the way, 后面的关系代词可以是that, in which或者是不加任何关 系代词。如：I like the way you talk. 5. 直接用于介词后作宾语的关系代词which不能换成that，直接用于介词后作宾 语的关系代词whom不能换成who。但若介词用于句末，则用作宾语的which, whom也可换成that, who 6.（1）which用于下列情况：( I )如果引导的是非限定性定语从句; （II）关系代词充当介词的 宾语，且介词位于关系代词之前;（III）先行词本身是that等。（2）that用于下列情况：( I ) 先行词是all, everything, anything, nothing, little, much等不定代词；（II）先行词被all, any, every, no, little, much, some等词修饰；（III）先行词被序数词、形容词最高级修饰或先行词本身是序数词；（IV）先行词被the only, the very(正是、恰是),the last修饰；（V）先行词中既有人也有物；（VI）在which或who的特殊疑问句中含有定语从句等。另外需要注意：先行词是the way，并在定语从句充当状语时，关系代词用that或省略，若用which,其前加介词in。 疑问：This was the house in which they lived last year. 是否存在这种方式并正确—— This was the house that they lived in last year. 7.当关系词在从句中充当主语时，可以省略，后面的动词发生形式变化—— 主动语态时，动词变成-ING形式 被动语态时，动词保留过去分词形式 I know the girl who comes from BJ. I often like reading short novels which were written by Hemingway. I often like reading short novels written by Hemingway. I raise a dog which is named KING. * I raise a dog named KING. I believe the candidate who made the speech in the assembly yesterday is sure to win the support. *I believe the candidate making the speech in the assembly yesterday is sure to win the support. I know the boy who was praised by the teacher. The book which is related to the development has been published recently. They lived in a house facing the south. = They lived in a house which faced the south. The workers working in the factory are well-paid. = The workers who work in the factory are well-paid. = The workers who are working in the factory are well-paid. The tie worn by our head was made in Shanghai. = The tie which is worn by our head was made in Shanghai. The book written by Wang sells well. = The book which was written by Wang sells well.