名词性从句
一. 什么叫“名词性从句”？名词性从句在功能上相当于名词
His job is important. I don’t like his job.
主语 宾语
What he does is important. I don’t like what he does every day.
This is his job. We students should study hard.
表语 同位语
This is what he does every day. I don’t know about the fact that he is a teacher.
相关概念:
1.名词：表示人或事物的名称的词
2.名词的句法作用：名词在句中主要作主语,宾语,表语和同位语。另外还可以作定语,状语。
3.名词性从句：在英语的句子结构中，本来该由名词充当的主 语、宾语、表语和同位语，由一个句子来充当,这个句子就叫:名词性从句。
二、 名词性从句的种类
1.When we will start is not clear.主语从句
2.Mrs Black won’t believe that her son has become a thief.宾语从句
3. My idea is that we should do it right now.表语从句
4.I had no idea that you were her friend.同位语从句
三、常见引导词：
连接词 ： that、 if、 whether
连接代词 ：who、 whose、 what、which
连接副词： when、 where、why、how、 how long
各种连接词的用法：
连接词 that、whether、if 不在它们引导的主语从句 中充当句子成分。
1. whether引导主语从句时，既可以直接位于句首，也可以位于句末；if 引导主语从句时只能用于it作形式主语的从句中。whether可以与or not连用，if则不行.
2. 连接代词who、whose、what、 which等都在句子中 担当一个句子成 分。比如：主语、宾语、定语等等。
3. 关系副词when、where、how、how long等分别在句子中作时间状语、地点状语、方式状语等等。
四、名词性从句七大常考考点：
考点1：连接词： that 与 what 的区别
That (a new teacher will come to our school ) is true .
What we can’t get seems better than what we have .
that 只起连接作用，无意义，在从句中不充当任何成分 what 既有连接作用， 又要在从句中作成分（ 主语，宾语， 表语）(… 的东西;物;话;时间;地点;人物;数目等不同概念)
what (什么) / which ( 表选择, 哪一个)
1. ---Do you know____what____Mr Black’s address is ?
---He may live at No. 18 or No. 19 of Bridge Street. I’m not sure of ______which___.
2. I read about it in some book or other, does it matter ___which____ it was?
考点 2 ：it作形式主语,形式宾语的用法
☺ it 作形式主语
1. It is a pity that he made such a mistake.
2.他来不来不重要。
Whether he will come or not doesn’t matter.=It doesn't matter whether he will or not.
It is well known/reported/ thought/said that…
It is clear/necessary/certain/true that…
It is a pity/a shame/an honor that…
It doesn’t matter whether…
It seems that…
It happens that…
☺. it 作形式宾语
(1) make /find/ feel / consider / think it + adj / n + that… / to do…
(2) it 指代后面从句所叙述的内容， 常用于这些动词后， like/dislike/love/hate /appreciate/make+it 后常跟if 或when从句
I hate it when people laugh at the old
(3) depend on it that….
1. I like __C_ in the autumn when the weather is clear and bright.
A. this B. that C. it D. one
2.You may depend on __C__ that you parents will help you whenever you need it.
A.them B. yourself C. it D. me
考点3 语序问题
★在名词性从句中,除了关联词要提到句首之外,一律要用陈述句语序
4.What time do you think _B_?
A.will Besty come here B.Besty will come here
C.is Besty coming here D.can Besty get here
疑问词+do you think\suggest\believe\suppose …+陈述语序
考点4 同位语从句和定语从句的区别
同位语从句一般跟在名词fact, news, promise, truth, belief, thought, idea, answer, information, knowledge, doubt, hope, law, opinion, plan, suggestion后面, 用以说明或解释前面的名词的内容.
定语从句：对先行词起修饰限制作用
The news that she passed the exam excited her parents . 同位语从句
解释说明；that在从句中不充当成分,但是不能省。
The news that we know from her excited all of us .
修饰限定；that在从句中有成分、作宾语时可以省。
判断方法：同位语从句可以变成表语从句。
1.The suggestion that he should not go there is of great value.
2. The suggestion that he made is of great value.
3.The fact that he won the first place can’t be denied.
4.The fact that he told me excited me.
注: 1. 同位语从句多用that 引导
2. 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.
考点5.选择填空
Whoever,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what,who等引导的名词性从句都含有疑问意义。
高考题选萃
注：wh-ever 既可引导名词性从句
又可引导让步状语从句，no matter wh- 只引导让步状丛
3. It is generally considered unwise to give a child ___B_ he or she wants.
A. however B. whatever C. whichever D. whenever
考点6.whether 与 if 均为 “是否” 的意思。但在下列情况下，whether 不能被 if 所取代：
1.不是it做形式主语的主语从句
Whether he will come is unknown.
2. 表语从句，如：The question is whether you should accept it.
3. 同位语从句，如：The question whether he’ll attend the meeting is not decided.
4.在介词后：如：I’m not interested in whether they’ll go or not.
It depends on whether we have got enough money.
5. 直接跟不定式连用，如：She hasn’t decided whether to go or not.
用if 或whether 填空
1.___A__ we’ll go camping tomorrow depends on the weather.
A. If B.Whether
C. That D.Where
考点7虚拟语气问题
1.在order，suggest（建议），demand，request，advise，insist(坚持应该)等所接的宾语从句中用should 型虚拟语气。should 常省略。
2.在order，suggestion等名词后同位语从句，表语从句中用should 型虚拟语气，可省略should
3.在as if，as though引导的表语从句中，在必要的情况下应用过去式虚拟语气。
4.在主语从句中用来表示惊奇、不相信、惋惜、理应如此等,谓语动词用虚拟语气“(should) +do”,常用的句型有：（1）It is necessary (important, natural, strange, etc.) that...
（2） It is a pity(a shame, no wonder, etc.) that...
（3） It is suggested (requested, proposed, desired, etc.) that...如: It is strange that she (should) think so.
wish后，从句中的时态在原本的时态上退一步
I wish that I __B__that film star yesterday.
A saw B. had seen C would see D has seen
温馨提示：答案为网友推荐，仅供参考