Grammar and usage ---Noun Clauses 名词性从句
名词性从句相当于名词，可分别作主句 的主语、表语、宾语和同位语。因此， 名词性从句可分为主语从句、表语从句 、 宾语从句和同位语从句。
I 名词性从句的种类
1.When we will start is not clear.
同位语短语
Beijing ,the capital of China, is my hometown.
同位语从句
We heard the news that our team had won.
We were happy to hear the news that was announced by our boss.
定语从句
1. (2008山东)____ was most important to her was her family.
A. it
B. this
☆ C. What
D. as
主语从句
2. (2009北京，31）At first he hated the new job but decided to give
主语从句
2. She 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
主语从句一般有三种结构： 1. 主语从句+谓语 That she will win the match is certain. 2.It+be+形容词（名词词组、过去分词）+that从句
It is important that we teens should learn English. It is good news that he will attend the meeting on behalf of our school.
It looks as if it’s going to rain. 3.the reason why … is that … 和It is because …等结构。
It wasΒιβλιοθήκη because I got up late.
同位语从句
同位语从句在句中作同位语，它一般要放在主 句中某些名词的后面，说明这些名词的含义。可跟 同位语从句的名词主要有： fact, news, promise, reason, idea, hope, word, belief等。
It is said that our school will hold a sports meeting 3. It +seem (happen，appear等不及物动词)+that从句 It seems that Katy is not coming to this party.
宾语从句
在句子中起宾语作用的句子叫宾语从句，宾语从句 放在及物动词或介词之后作宾语。 宾语从句的结构 主句 + 连接词(引导词) + 宾语从句
1. I don’t know _w__h_et_h_e_r_/_i_f I’ll be free tomorrow.
2. I don’t know _w_h_e_t_h_er_ or not I’ll be free tomorrow.
3. The question is _w_h_e_t_h_e_r this book is worth writing.
himself a few months to see _____it got any better.
A.When B. how
C. why
☆D. if
宾语从句
3. (2006全国I,23）See the flags on top of the building?
That was _____ we did this morning.
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只能使用whether 的情况：
a. 主语从句并在句首 b. 表语从句 c. 同位语从句
If 表-是否-
常用于动词
后的宾语从 句
e. 介词后的宾语从句
f. 直接加动词不定式只能用whether （to do）
高考题选萃
1. ____ the 2000 Olympic Games will be
I don't know why he is always late for school.
We all agree with what you said at the meeting.
表语从句
表语从句位于连系动词后,有时用as if引导。 其基本结构为:主语 + 系动词 + that从句。 1. be, look, remain, 等系动词后均可跟表语从句： My suggestion is that we should go shopping. 2. as if 也可引导表语从句。
C. whether D. what
I. 名词性从句的引导词：
1.连接词 ：that、if、whether
不作成分
无意义
“是 否”
2. 连接代词 ：who、 whom 、whose、 what、
which
作主/宾/
表
3. 连接副词： when、 where、why、how
作状语
注意: 区别if 与whether
表语从句
A. When B. which
C. where
☆D. what
4. (2009浙江，12）Is there any possibility _____ you could pick me up
at the airport?
同位语从句
☆ ---No problem.
A. When B. that
5. It depends on _w_h_e_t_h_e_r we will have enough money.
6.W__h_e_t_h_e_r they can do it matters little to us.
7. __I_f__ you are not free tomorrow, I’ll go without you.