1.?主语从句如果表达的是一个事实，一般由that引导。that在从句中无词义，不充当句子成分，仅起引导作用。如：
That?she?was?chosen?made?us?very?happy.?她被选上了，我们很高兴。
That?the?earth?goes?round?the?sun?is?known?to?us?all.
2.?由whether引导的主语从句，表示“是否”之意，注意不能用if。
Whether?she?will?come?or?not?is?still?a?question.
他能否来还是个问题。
It?is?doubtful?whether?he?will?be?able?to?come.
她能否来令人怀疑。
3.?由疑问词引导的主语从句，从句中要用陈述语序。如：
What?should?be?done?has?been?done.
应该做的事情都做了。
What?we?need?is?more?time.
我们所需要的是更多的时间。
When?we?shall?have?our?sports?meet?is?still?a?question.
=?It?is?still?a?question?when?we?shall?have?our?sports?meet.
什么时候开运动会还是个问题。
What?he?did?is?not?yet?known.
=?It?is?not?yet?known?what?he?did.
他干了什么还不清楚。
4.?whatever，whoever，whichever等引导的主语从句。（注意不能转化成it作形式主语的句型）。如：
Whatever?was?said?here?must?be?kept?secret.?这儿无论说的什么事都必须保密。
Whoever?breaks?the?law?will?be?punished.?无论谁犯了法都要受到惩罚。
Whichever?you?choose?is?fine?with?me.无论你选哪个我都无所谓。
5.?常见句型
1）由“It?is?+?adj.?+?that…”构成的主语从句。
It?is?certain?that?we?shall?be?late.?我们肯定要迟到了。
It’s?strange?that?he?didn’t?come?yesterday.?真奇怪他昨天没来。
2）由“It?is?+?n.?+?that…”构成的主语从句。
It?is?a?pity?that?you?didn’t?see?the?film?yesterday.
It?is?a?wonder?that?he?refused?such?a?good?offer.
3）由“It?is?+?过去分词?+?that…”构成的主语从句。
It?is?reported?that?the?sports?meet?has?been?put?off.
据报道运动会推迟了。
It?has?not?been?decided?that?when?and?where?we?will?hold?the?meeting.
什么时候，在哪里开会还没有决定。
4）由“It?+?不及物动词?+?that…”构成的主语从句。
It?turns?out?that?he?has?never?been?there.
原来他根本没去过那儿。
It?occurred?to?her?that?she?might?as?well?talk?it?over?with?him.?她想起不妨去和和他谈谈这件事。
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