每每看着你自己那一“I” 到底，满是I can, I will的作文，再看看别人家那满是你读都读不懂的长句子作文，你是否也会有这样的感叹：“老铁，扎心了。”
别羡慕他们，真的，你已经学会了定语从句，今天再来一法宝——名词性从句，你也能变身为他眼中的奥特曼！
名词性从句概览
在复合句中起名词作用的从句叫名词性从句 (Noun Clauses）。名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分为:主语从句、宾语从句、表语从句和同位语从句。
1）.How the book will sell depends on its author. (主语位置，主语从句)
2）.John said that he was leaving for London onWednesday. （谓语动词后面，宾语从句）
3）.The fact is that he has not been seen recently. （系动词后面，表语从句）
4）.He will talk to us about what he saw in U.S.（介词后面，宾语从句）
5）.It is impossible that I go and attend themeeting. （主语从句）
6）. The fact that hehad not said anything surprised everybody. （同位语从句）
名词性从句连接词的用法
连接词：1. that; 2. whether; 3. what/where/when/which/wh-ever/
however
可使用的名词性从句: 1.主、宾、表、同; 2.主、宾、表、同; 3.主、宾、表、（同）
是否充当从句的句子成分: 1.否；2. 否；3. 是
可否省略：1.动词后宾从中可省；2.否； 3.否
可否用其他词代替1.否 ；2.动词后宾从可用it代替； 3.否
以上连接词的共同作用是：连接主句和从句（连接作用）
连接词的选用
1.that/what的选用
that 和 what都可引导所有的名词从句。但是，what除起连接作用外，还在名词性从句中_作成分_，可做从句的主语、宾语、或表语。而that在名词性从句中_不作成分_。
1）.______ he wants is a book.
2）. ______ he wants to go there is obvious.
3）.The result is ______ we won the game.
4）.This is _____ we want toknow.
5）.We should pay attention to ______ the teacher is saying.
6）. We are interested in the news______ some foreigners would visit our school.
2.if/whether的选用
1）. I asked her __________she had a bike.
2）. We’re worried about________ he is safe.
3）. ________ we will hold a party in the open air tomorrow depends on the weather.
4）. The question is_________ he should do it.
5）. I don’t know ___________ he is well or not.
6）. I don’t know _______ to go.
Summary 总结 (不能使用if 的情况)：
总结：1）. if只能用在动词后的宾语从句,不能用在介词后的宾语从句
2）.if 不能用在主语从句中
3）. if 不能用在表语从句中
4）. whether or not 连在一起引导宾语从句时不用if.
5）. whether to do 做动词宾语, 不能用if todo.
3.其他连接代词和连接副词的选用
主要根据名词性从句中的具体意义,正确的选择who、which、when、where、why、how 等连接词，这些连接词既具有疑问含义，又起连接作用，同时在从句中充当各种成分。
我们何时举行运动会还没有决定。________ we shall hold our sports meeting is notdecided.
我不知道昨天谁打破了玻璃。I don’t know _________ broke the glass yesterday.
我不知道他长的什么样子。I have no idea _________ he looks like.
这就是我忘记眼镜的地方。This is _________ I left my glasses.
主要考点
考点1. 语序问题
名词性从句在句中要用_陈述___语序,从句的引导词必须始终置于从句的句首。
1）.No one can be sure ____ in a million years.
what will man look like B. what man will look like
C. man will look like what D. what look will man like
2）.You can’t imagine ____ when they received thesenice Christmas presents.
A. how they were excited B. how excited they were
C. how excited were they D. they were how excited
考点2. 时态问题
1）. He said that he will go tothe station. 改错（）
2). Our physics teacher once told us that light__________ （ travel ） faster than sound.
3). Tom says that Mary ____ (go) abroad last year and _________ (be)there for nearly 5 months
总结：1）主句的动词用过去时，从句谓语动词用过去的某种时态；
2）主句的动词用过去时，从句表示客观事实，格言，谚语等，从句谓语动词用一般现在时；
3)主句的动词用一般现在时，从句谓语可根据需要选用各种时态。
考点3. 主谓一致问题
何时开会还没有决定。 When the meeting will begin _____(have) not been decided yet
他们何时出发和他们去哪里还没有决定。When they will start and where they will go______(have) been still unknown.
何时何地开会还没有决定When and where the meeting will begin _____ (have) not been decided yet.
总结：单个的主语从句作主语时，谓语动词一般用单数形式。
如果是两个或两个以上的主语从句作主语，谓语动词则用复数形式。
由两个或多个连接词引导一个主语从句，谓语动词用单数形式。
考点4. it作形式宾语和形式主语问题
1). I think_____ worthwhile that we spent so much money on these books.
2). _____ is hard to decide when and where we will held our sports meeting.
总结：当主语从句较长，而谓语较短时，常常将从句_放后_，而用it 作为形式主语置于句首。it也可作形式宾语。
高考链接
1). It iso bvious to the students ______ they should get well prepared for theirfuture.
A. as B. which C. whether D. that
2). When asked _____ they needed most, the kids said they wanted to feel important and loved.
A. what B. why C. whom D. which
写作升华
写作中,得高分的方法之一: 改造低级句型,让你的英语靓起来
原句: 1）He gave me something. 2）It was a Christmas present and a heart full oflove.
改装后：What hegave me was a heart s not only aChristmas present but also full of love
原句: 1）Some of the happiest people in the world are thosepeople.
2）Those people help to bring happiness to others. 3）Volunteersbelieve it .
改装后：1）Some of the happiest people in the world are thosewho help to bring happiness to others. .
2）Volunteers believe that some of the happiest peoplein the world are those who help to bring happiness to others.
THE KEY： 1. what, that, that,what, what, that 2. if/wheter, 其余都是whether 3. when,who, what, where
1. BB 2. will 改为would, travels, went, has been 3. has, have, has 4. it, It 高考链接： DA
怎么样，新技能get到木有，快回家试着改改你的作文吧，争取下次亮瞎老师的——（呃 ？）老眼！