名词性从句1名词性从句：在句子中起到一个名词的作用，并充当句子的主语、宾语、表语或同位语的从句。
分别称之为主语从句、表语从句、宾语从句和同位语从句。
了解并正确使用关联词是写好名词性从句的关键。
判断依据：1.看在从句中有无具体意义；2.看在从句中有无充当成分。
如有，是充当什么成分常见的关联词：which, how, why, whenever, what, whether who, when, whom, whose, that，whatever, whoever, where, whomever, wherever，whichever，if，however一、名词性从句的关联词的分类、词义和用法见下表：二、从句中that和what的区别连词that只起连接作用，在从句中不作成分，不含有疑问意义，而what在从句中作成分，常含有疑问意义。
表“…的东西/事情/样子/的话/的地方”，在从句中充当主语、宾语、表语。
主语从句、表语从句、同位语从句中用that但不能省略。
1. I wonder if this is ______you are looking for.2. Our school is quite different from _______ it was before.3. Father made a promise ______ if I passed the examination he would buy me a computer.I can’t understand is why he has changed his mind.earth is round is known to us all.6. Is _____ he told us true7. I have no doubt _____ he will come.8. I have no idea _____ he did that afternoon.三、who 与 whoever ；what 与 whateverwhoever, whatever等引导的名词性从句不含有疑问意义，相当于名词后加一个定语从句，而who, what等引导的名词性从句都含有疑问意义。
was said here must be kept secret.2. _______we need is more time.made the long distance call to him is not important.breaks the law will be punished.四、that 引导同位语从句与that 引导定语从句的区别引导同位语从句的that 无实际意义, 不作从句的任何成分, 而引导定语从句的that 从句的某个成分。
He told me the news that our team won the match. (同位语从句)He told me the news that was very exciting. (定语从句)五、if 与whether1. 主语从句：whether引导主语从句位于句首,if引导主语从句不能位于句首Whether we will succeed is still a question.It is not known if he will come.2. 表语从句：只能用whether ，if不能引导表语从句The problem is whether the film is worth seeing.3. 宾语从句：whether 与if 有时可以换用，但下列情况只能用whether①介词后的宾语从句Everything depends on whether it is fine tomorrow.②whether…or not的宾语从句I don’t know whether or not she’ll like it.③复合不定式只能用whetherTell us whether to go or stay here.六、在have no idea 之后常用wh-引导同位语从句I have no idea where he has gone.I have no idea when he did it.I have no idea what he did.七、it作形式主语或形式宾语的高级句型1．it作形式主语的常用句型(1)It＋系动词＋形容词 (necessary/right/likely/unlikely/ wrong/ important/ certain等)＋that 从句(2)It＋be＋名词(短语)(a pity/a shame/no wonder等)＋that从句(3)It＋be＋过去分词(said/told/reported/decided等)＋that从句(4)It＋特殊动词(seems, appears, happens, matters)＋that从句(5)It doesn't matter who/whether/if等从句2．it作形式宾语的常用句型动词find, feel, think, consider, make, believe, guess, suppose, assume等后有宾语补足语时，则需要用it作形式宾语，而将宾语从句后置。
八、有用的句型1.… 的原因是…1)The reason for + 名词+ is that…2)The reason why + 句子+ is that…他缺席的原因是他……。
1)The reason for his absence is that…2)The reason why he was absent is that…2. This / That / It is + where / why / how / because, 表示具体的地点、原因、方式1)这就是我们为什么应该保持健康的原因。
This is why we should keep healthy.2) 这就是我停车的地方。
This is where I parked my car.过关强练：Ⅰ.用正确的关联词填空1. 我的问题是我没有时间和他交流。
My problem is______ I have no time to communicate with him.2. 问题是这本书是否值得一读。
The problem is_______ this book is worth reading.3. 她没有去上学的原因是她生病了。
The reason_____ she didn’t go to school was______ she was ill.4. 我的意见是你不该一个人去。
My opinion is______ you shouldn’t go alone.5. 今天的中国已不是过去的样子了。
China today is no longer_____ she used to be.6. 那是因为这两兄弟想要打赌。
Th at’s_______ the two brothers wanted to make a bet.7. 我的建议是我们明天应该早点出发。
My suggestion is______ we (should) set off early tomorrow.Ⅱ.用宾语从句或表语从句完成下列句子1．a. Where is the post officeb. He doesn't know that.He doesn't know__________________________________.2．a. How should we do the workb. Did she say anything about itDid she say anything about ________________________3．a. Will that man turn up in timeb. It's a question.The question is________________________________4．a. Yesterday's game makes me feel excited.Yesterday's game is ________________________________.5．a. He told me something that I should read.He told me _______________________________________.Ⅲ.用主语从句改写下列句子1．a. Is he coming or not b. It is still uncertain.It is still uncertain _________________________________.2．a. Why did he do it b. It remains a mystery.________________________ remains a mystery3．a. Something controls the flow of carbon dioxide in and out the atmosphere today. is pretty well understood.It is pretty well understood_______________________4．a. Such a thing happened in your class. b. It was a pity._________________________________________________5． The thing that you need is more practice._________________________________________________Ⅳ.用同位语从句改写下列句子1．a. They are familiar with the opinion. b. All matter consists of atoms.They are familiar with the opinion__________________________________________________. 2．a. Where did you get the idea b. I could not come.Where did you get the idea _________________________________________________3．a. We haven't yet settled the question. b. Where are we going to spend our summer vacation We haven't yet settled the question _________________________________________________. 4．a. They didn't finish the work. b. They have to face the fact._________________________________________________5．a. I made a promise. b. I will write to you as soon as I get to Beijing._________________________________________________Ⅴ.将下列每组题中的两个简单句合并为一个含有名词性从句的复合句1．a. The manager said a lot at the meeting. b. His words were very attractive.________________________________________________2．a. When did you enter the roomb. The police wants to know it.________________________________________________3．a. This is my decision. b. All of us are to start at 6 o'clock tomorrow morning.________________________________________________4．a. Our women volleyball team had won the championship. b. The news encouraged us all greatly. _________________________________________________5．a. We should practise oral English for an hour every day. b. That was our rule.We made it a rule that ________________________________________________6．a. Many people in the area are short of money. b. This is a question._________________________________________________7．a. The manager said a lot at the meeting. b. His words were very attractive._________________________________________________8．a. He has succeeded in passing the examination. b. It is good news._________________________________________________9．a. We should not overuse our eyes and do more outdoor exercises. b. He suggested it. _________________________________________________10．a. Our women volleyball team had won the championship. b. The news was it.c. The news encouraged us all greatly._________________________________________________11．a. She lost her way and her home was nearby. b．The girl told it to us._________________________________________________Ⅵ. 单句翻译1．我坚信未来掌控在我们自己的手中。