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主语从句是名词性从句的一种，它是中学阶段的重点语法项目，也是高考的热点，为使同学们较好地掌握主语从句的用法，现将其用法要点归纳如下：
一、恰当选用连词
引导主语从句的连词有以下几种；
1.连词that
连词that没有意义，在从句中也不作句子成分，但不能省略。例如：
1)That he is often late for class makes our teacher very angry.
2)＿＿fashion differs from country to country may reflect the cultural differences from one aspect.（2002上海春招）
A.What B.That
C.This D.Which (Key:B)
2.连词whether
whether在句中不作句子成分，但有意义，作“是否”解。例如：
1)Whether he can finish his task on time is very important.
2)＿＿we'll go to camping tomorrow depends on the weather. (NMET96)
A.If B.Whether
C.That D.Where (Key:B)
3.连接代词what/whatever,which/whichever,who/whoever,whom/whomever,whose
这些连接代词在句中既有意义，又作句子成分。其中what/whatever,which/whichever,who/whoever在从句中可作主语，宾语，表语等；whom/whomever在从句中作宾语；whose在从句中作定语。例如：
1)Whoever makes mistakes must correct them.
2)What he said at the meeting is of great importance.
3)Whose wallet this is is not known yet.
4)＿＿we can't get seems better than＿＿we have. (NMET97)
A.What,what B.What,that
C.That,that D.That,what (Key:A)
5)＿＿she couldn't understand was＿＿fewer and fewer students showed interest in her lessons. （2000，上海）
A.What...why B.That...what
C.What...because D.Why...that(Key:A)
6)I read about it in some book or others,does it matter＿＿it was? （2001，春招）
A.where B.what
C.how D.which (Key:D)
【简析】题干中已交待了某一本书或是另外的书，只是没有明确哪一本而已，所以用which而不是what来引导主语从句。题干中的第二个it作形式主语。
4.连接副词where,when,how,why
这些连接副词有意义，并在从句中作状语。例如：
1)How they will solve the serious problem has not been decided.
2)Where we can look up his address is still a problem.
二、主语从句应用陈述语序
【误】 1)What did he say at the meeting is quite right.
【正】 2)What he said at the meeting is quite right.
三、在下列句型中，主语从句中要使用虚拟语气
1.It is suggested/required/ordered/demanded...+that-clause。
本句型的动词为表示命令、要求、建议等意义的动词，从句中谓语动词用“should+动词原形”的形式，should可以省略。例如：
It is suggested that you should spend more time on English.
2.It is strange/astonishing/surprising...+that-clause。
从句中谓语动词用“should+动词原形”的形式，should一般不省略。意为“竟然、居然”，表示说话人的惊异、懊悔、失望等情感。例如：
It is strange that she should marry such a poor man.
3.It is important/natural/necessary/impossible..+that-clause。
该结构中，从句谓语动词也要使用“should+动词原形”的形式，should表示“当然”之意，即说话者认为“应该如此”。例如：
It is natural that he should get angry with her.
四、it可用来作形式主语
在某些情况下，可以由it作形式主语，而把真正的主语从句移到后面，例如：
1)Whether he will play the part is still unknown.
=it is still unknown whether he will play the part.
2)That doing exercise is good for health is common knowledge.
=It's common knowledge that doing exercise is good for health.
3)＿＿is a fact that English is being accepted as an international language. (NMET95)
A.There B.This
C.That D.It (Key:D)
4)It worried her a bit＿＿her hair was turning grey. (MET92)
A.while B.that
C.if D.for (Key:B)
说明：
1.当What,whatever,whoever,Whichever引导主语从句时，一般不用it作形式主语。例如：
1) 【误】It is more money what he needs.
【正】What he needs is more money.
2)【误】It will be punished whoever breaks the law.
【正】Whoever breaks the law Will be punished.
2.在下列结构中，主语从句一般不提前。
(1)在It doesn't matter+how/whether...结构中。例如：
It doesn't matter how he solved the problem.
(2)在It's said/reported/announced/believed...+that-clause结构中。例如：
It is said that the highway will be open to the traffic next year.
(3)在“it is a pity...”,“it is no wonder...”,“it is likely...”结构中。例如：
It's a pity that you didn't pass the exam.
(4)当含主语从句的复合句是疑问句时。例如：
Isn't it good news that Mary is coming back tomorrow?