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找出主语从句
That he will succeed is certain. Whether he will come makes no
difference. What we need is more time.
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引导词
1) 从属连词that和whether：
• That he will come is certain.
been decided.
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引导词
3)连接代词whoever, whatever, whichever • Whoever comes is welcome.
• Whatever I have is yours. • Whichever you want is yours.
whatever=anything that whoever=anyone who
happy. That he passed the exam made the teacher happy.
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理解主语从句
他何时要来还不清楚。 When will he come? It is not clear. When will he come is not clear.
When he will come is not clear.
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2) It is + adj. +that It’s certain that… 肯定… It is possible/likely that... 很可能…… It is obvious/clear that… 很明显… It is true that…的确… It is necessary \important \natural\... that… +(should) +do…
• Whether he will come is uncertain.
_t_h_a_t_ 只起引导作用，本身无意义，不充当
任何分，但不能省略。
whether 不做成分，表“__是__否___”。 在主语从句中只能用 _w_h__e_t_h_e__r,不能用_i_f_
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引导词
2) 连接代词who, what, which • Who will go makes no difference. • What we need is more time. • Which book I shall choose hasn’t
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引导词
4) 连接副词when, where, how ,why
• When we will leave hasn’t been decided. • How she keeps healthy is a secret. • Why he cries is not clear. • Where the meeting will be held is not the match is certain. It is certain that he will win the match.
注解：一般来说主语从句都是放在 句首 , 但有时为了使句子 保持平衡 ，避免"头重脚轻", 常用 it 作 形式主语 ，从而把主语从句放在 后面 ．
2. 真可惜你错过了这么一个好机会。 It is a pity that you missed such a good
chance. 3. 事实是我们周围的污染正变得越来越严重。
It is a fact that the pollution around us is becoming more and more serious.
Noun clauses as the subject
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什么是主语？
I like English. The train left.
主语：是一个句子说明的人或事物,即叙
述的主题，一般位于_句__首___ 。
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找出主语
Jim is good at playing the piano. (名词 To see is to believe. （不定式） ） Smoking is bad for health. （动名词） What he has said is true. (从句）
• 2.明确it作形式主语和形式宾语、代替主语 从句及宾语从句的用法，及其与强调句的 区别。
• 3.区分that引导的同位语从句及定语从句。
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理解主语从句
他通过了考试让老师很高兴。 He passed the exam. It made the teacher happy. He passed the exam made the teacher
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这样就构成了下面一些常用句型:
1) It is + n. +that
It is a pity/shame that... 可惜的是……
It is a surprise that… 令人吃惊的是…
It is a fact that…
事实是…
It is common knowledge that … …是常识
known.
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•主语从句的特点：
1.引导词：
从属连词 that, whether； 连接代词 who, what, which；
whoever, whatever, whichever; 连接副词 when, where, how和why。
2. 语序：陈述句语序
3. 在主语从句中只能用whether,不能用if
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主语从句 (Subject Clause)
在主从复合句中充当主语的从句就 是主语从句, 它是名词性从句之一 。引导主语从句的连接词有： 从属连词that, whether；连接代词 who, what和which；连接副词 when, where, how和why。
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考纲专题解读
• 1.了解名词性从句的基本用法，掌握名词性 从句的引导词及引导词在名词性从句中的 作用，辨析that与what,if与whether等引导 词的用法。
*__It__is_a__p_i_ty__th_a_t__(很可惜)we lost the match. *__It__is_a__f_a_ct__th_a_t_(这是事实)he cheated in the exam.
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1. 令人吃惊的是他改变了主意。 It is a surprise that he changed his mind.