(3) The man that our headmaster talked to just now is our English teacher. (4) The man our headmaster talked to just now is our English teacher. 第4句简洁、自然，所以口语中用得最多。 3. 当关系代词泛指人时，多用that。例如： He is a man that is never afraid of failure. 他是个从不怕失败的人。（that用来泛指人）
4. 当关系代词出现在who开头的疑问句时，应用that。例如： Who is the girl that is talking to Tom in English?
用英语同汤姆交谈的那个女孩是谁？（避免重复使用who，以免造成误解或语义含混不清）
（二）关系代词which与that的区别
1. 当先行词为all, much, little以及不定代词anything, something, everything等时，关系代词多用that。例如： All that glitters is not gold. 闪闪发光物，未必尽黄金。
She told me everything that she knew. 她把她所知道的一切都告诉了我。
2. 当先行词的前面有形容词最高级、序数词或限定词the only, the very, all, every, any, no等时，关系代词一般都用that。例如：
This is the best novel that I have ever read. 这是我读过的最好的一部小说。
He is the only person that has been invited to the ball. 他是惟一应邀参加舞会的人。 3. 当关系代词出现在which开头的疑问句时，应用that。例如：
Which was the hotel that was recommended to the foreign guest? 哪一个是推荐给外宾的宾馆？（这里使用that很明显是为了避免重复which）
4. 在非限制性定语从句中，关系代词一般只用which。例如：
Beijing, which is the capital of the People’s Republic of China, will host the 2008 Olympic Games. 北京是中华人民共和国的首都，将主办2008年奥运会。 5. 介词后的关系代词用which，而不用that。例如：
She has collected 600 stamps, 60% of which are German stamps. 她收集了600张邮票，其中60％是德国邮票。
六、定语从句的位置
如前所述，定语从句一般总是直接置于所修饰的名词或代词之后。有时候，定语从句与先行词之间插入了其他的短语，这样它们被分隔了，这种情况下的定语从句被称作隔离定语从句。例如： There was a girl upstairs who was shouting and crying, obviously mad.
楼上有一个女孩，大喊大叫。很明显，她疯了。（定语从句who was shouting and crying修饰the girl，被upstairs所隔开）
A new master will come tomorrow who will teach you German. 明天要来一位新老师教你们德语了。（定语从句置于句末以示强调） B、宾语从句
宾语从句是英语复合句中的其中非常重要的从句之一。它是用一个句子做另一个句子的宾语，将这个句子叫做宾语从句。宾语从句做介词或及物动词的宾语。现在从下列三个方面总结归纳如下： 一，引导词
A,由that 引导的陈述句性的宾语从句，在很多动词如say, think, wish , hope, see, believe, agree, expect, hear , feel等动词后。连词that只起连接作用，在从句中不做句子的成分，也无词汇意义，在口语中常被省略，但在大多数情况下还是以不省为好，特别是在笔语中。 例：I told him that he was wrong.
l在think,believe, suppose, expect等动词引起的宾语从句中，有时谓语尽管是否定意义，却不用否定形式，而将think 等动词变为否定形式。
例：I don’t think you are right. (我认为你做的不对)
l在许多带有复合宾语的句子中，that引导的宾语从句经常移到句子的后面，而用it做形式宾语。 例：We think it wrong that he told a lie to everyone (我认为他向每一个人撒谎是错误的)
B,由连词if、 whether 引导的表示“是否…”的宾语从句。Whether,if 在从句中不做句子的成分，一般情况下，whether和if 可以替换。
例：I don’t know if/whether he will come tomorrow. The teacher asked if/whether we had finished the experiment. l在介词后面的宾语从句中不用if引导
例：Everything depends on whether we have enough money。 l宾语从句中有or not时不用if引导.
例：I don’t know whether the movie star will come or not. l和不定式连用作宾语时不用if引导.
例：Whether to go there or not hasn’t been decided.
C,由wh-引导的宾语从句。连接代词who,whom,whose, what, which,和连接副词when, where, why, how 等连接的宾语从句，它们在句中即有连接从句的作用，又在句中充当句子的成分。 例：Do you know which film they are talking about? (which做定语) I don’t know where he lives. (where 做地点状语) 二，宾语从句的语序，
宾语从句从句的语序必须是陈述语序，既连接词+主语+谓语+其他成分 例：I believe that they will come soon.
He asked me whether I was a teacher. They wanted to know what they can do for us. 二，宾语从句的时态。 宾语从句的时态受主句的限制，
既：主句是一般现在时态，从句根据实际情况而定。
主句是一般过去时态，从句用相应的过去的时态。如果从句的动作发生在主句之前，则从句要用过去完成时态。 例:
1)She says that she is a student. She said that she was a student.
2)She says that she will fly to Japan in a week. She said that she would fly to Japan in a week. 3)She says that she has finished her homework already. She said that she had finished her homework already. 4)She says that she can sing a song in English. She said that she could sing a song in English.
l如果宾语从句说的是客观真理、自然现象或事实时，这时宾语从句要用一般现在时态。 例：The teacher said that the earth goes round the sun. He told me that Japan is an island country.
lCould you tell me…是用来征询对方的意见，语气委婉，并不表示过去。 例：Could you tell me when we will visit the Histury Museum? 注意事项：
u由陈述句变成宾语从句时，要注意人称的变化。 例：She said: “I have been to England before.” She said that she had been to England before. She asked me: “Do you like maths?” She asked me if I liked maths. u宾语从句与简单句的交换。
由连接代词和连接副词引导的宾语从句，如果宾语从句的主语和主句的主语是同一个人时，可以用“疑问词+不定式 ”做宾语的简单句结构。
例：I don’t know what I should do next. I con’t know what to do next. He didn’t know where he would live. He didn’t know where to live.
DO SOME EXERCISES: 1.Can you see________?
A. what he’s reading B. what is he reading C. what does he read D. he reads what
2.Does Jack come from Japan? Do you know?(合并成一个句子) Do you know_____Jack _____from Japan? 3.---What did your son say in the letter? ---He told me that he_______ the Disney would the next day A.will visit B. has visited C. is going to visit D. would visit 4.He didn’t know__________
A.what’s the matter B.what the matter is C. what was the matter D. what the matter was 5.Somebody called you just now,but I didn’t know____
A.who were they B. who they were C. who was it D. who it was 6.I want to know_____
A.what is his name B. what’s his name C. that his name is D. what his name is 7.---Could you tell me ___she is looking for? ---Her cousin,susan. A.that B.whose C .who D.which
8.---What are you searching the Internet for? ---I’m trying to find out____.
A.What is the difference between SARS and BIRDFLU B.How many persons have died in Iraq C.How to protect our environment D.Why is our Chinese team be able to beat Korea 9.Do you know___________________________________________________?(谁正在唱歌) 10.Do you know__________________________________________________?(她正在和谁谈话) 11.Do you know___________________________________________________?(昨天发生了什么事) The keys: 1 A.2 if ,comes.3D. 4 C. 5 D. 6 D. 7 C. 8 B 9 who is singing 10 who she is talking with 11 what happened yesterday C、同位语从句 (一) 概念
一般来说，在主从复合句中,用作同位语的从句叫同位语从句。它通常跟在某些名词之后，用以说明或解释该名词
表示的具体内容。可以跟同位语从句的名词通常有：advice, decision, fact, hope, idea, information, message, news, promise, proposal, reply, report, suggestion, word（消息），problem， question, doubt, thought等。例如：
They were delighted at the news that their team had won. 当听到他们队获胜的消息时，他们欣喜若狂。
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