It is necessary \important \natural\... that… +sb (should) +do…
*_I_t _is_p__o_ss_i_b_le__th__a_t (很可能)she will come back tomorrow.
*_I_t _is_o_b__v_io_u_s__th_a_t_(很明显) he is an English.
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1. 很可能他会申请这项工作的。 It is likely that he will apply for the job.
2. 的确我犯了个错误。 It is true that I made a mistake.
3. 有必要我们要学习英语。 It is necessary that we should learn English.
• Whatever I have is yours.
• Whichever you want is yours.
whatever=anything that whoever=anyone who
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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
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3) It +不及物动词+that
It happened that...
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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.
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 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 ．
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这样就构成了下面一些常用句型:
1) It is + n. +that
名词
2. They didn’t know my address.
代词
3. Seeing is believing.
动名词
4. To do morning exercises this morning is
not good for your healthy.
动词不定式
5. That he will come here is of great help.
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
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That he will win the match is certain.
It is a fact that the pollution around us is becoming more and more serious.
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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…
从句
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主语从句 (Subject Clause) 在句子中充当主语的从句就是主语从句。
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读下列谚语，找出主语从句
What is learned in the cradle is carried to the grave.
儿时所学，终生难忘。
What’s done cannot be undone.
生米煮成熟饭。
What’s lost is lost.
失者不可复得。
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引导词
1) 从属连词that和whether：
• That he will come is certain.
• Whether he will come is uncertain.
_t_h_a_t_不做成分，无意义，不能省略。 whether 不做成分，表“__是__否___”。
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
*__It__is_a__p_it_y__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.
Subject Clauselike English. The train left.
主语：句子说明的人或事物,一般 位于_句__首___ 。
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请找出下面句子的主语
1.The villagers didn't realize how serious the
pollution was until the fish in the river died.
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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
been decided.
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引导词
3)连接代词whoever, whatever, whichever • Whoever comes is welcome.