考点七十一主语从句主语从句是在复合句中担任主语的句子。
其特点有：（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ifThat he will win the match is certain.It is certain that he will win the match.1. 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，从而把主语从句放后面。
常以it作形式主语的句型有：①It is＋形容词＋that...☞It is certain that she will do well in her exam．毫无疑问她考试成绩会很好。
②It is＋名词词组(no wonder, an honour, a good thing, a pity, no surprise, common knowledge, a surprise, a fact, etc.)＋that...☞It’s a pity that we can’t go.很遗憾我们不能去。
③It is＋过去分词(said, reported, thought, expected, decided, announced, arranged, etc.)＋that...☞It has been suggested that much should be done to prevent the river from being polluted.有人建议应做更多的工作阻止河流遭受污染。
④It appears/seems that...|It happens that...|It occurred to me that...|It turned out that...☞It turned out that nobody remembered the address.结果发现没人记得这地址。
⑤It doesn’t m atter that...|It makes no difference that...☞It doesn’t matter whether she will come or not．她是否来这无关紧要。
2. 当that引导的主语从句出现在疑问句中时，要以it作形式主语，而把主语从句后置。
☞Does it matter much that they will not come tomorrow?他们明天不来很要紧吗？3. 当主语从句出现在感叹句中时，要以it作形式主语，而把主语从句后置。
☞How strange it is that the children are so quiet!孩子们这么安静真奇怪！单句语法改错①What will they do next has not been decided.②No matter who says that is a liar.③That she says will not make any difference to our arrangements.④What we need is reference books.⑤If we will go there tomorrow depends on the weather.【2017·北京】Every year, ____makes the most beautiful kite will win a prize in the Kite Festival.A. whateverB. whoeverC. whomeverD. whichever【答案】B【解析】句意：每年，任何一个做出最漂亮的风筝的人将会在风筝节获奖。
空格所在部分是主语从句，缺少主语，用连接代词，根据意思可知是人获奖。
1.【2016·北京】24. Your support is important to our work. ________ you can do helps.A. HoweverB. WhoeverC. WhateverD. Wherever【答案】C【解析】：考查主语从句。
do后缺少宾语，表示任何事情。
3.【2016·江苏】21.It is often the case ______anything is possible for those who hang on to hope.A. whyB. whatC. asD. that【答案】D【解析】：考查主语从句。
It是形式主语，真正的主语是连接词that引导的主语从句，that 不作任何成分，只起连接作用，不能省略。
一单句语法填空1._____ we understand things has a lot to do with what we feel.2._____ Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.3.Exactly__the potato was introduced into Europe is uncertain, but it was probably around 1565.4._____ I want to tell you is the deep love and respect I have for my parents.5._____ struck me most in the movie was the father’s deep love for his son.6._____ makes the book so extraordinary is the creative imagination of the writer.7._____ one of you breaks the window will have to pay for it.8.It remains to be seen _____ the newly formed committee’s policy can be out into practice.9._____ he considered a great proposal was turned down by the boss at the meeting.10.----It’s my treat today. Is there anything particular you would like to have?----_____ you choose is fine with me.二单项选择题1. Your support is important to our work. ______________ you can do helps.A. HoweverB. WhoeverC. WhateverD. Wherever2. ______________ bothers me is that the young man seems to know a bit too much.A.WhetherB.WhatC.WhichD.That3. Top players must have excellent ball control, but it is not just ______________ they do with their feet ______________ counts.A.how；thatB.that；whatC.whether；whatD.what；that4. ______________ Tom will win the computer competition remains a secret till next Monday.A.WhenB.ThatC.WhatD.Whether5. ______________ that the Chinese government plans to end its one-child policy and instead let families have two children.A.It was reportedB.What was reportedC.It has reportedD.As was reported考点七十一主语从句参考答案高考考点问诊①将will置于they之后【解析】主语从句要用陈述语序。
②No matter who→Whoever 【解析】引导让步状语从句时no matter who和whoever二者可互换，但引导主语从句时只能用whoever，此处为主语从句。
单句语法填空1.How 句意：我们理解事物的方式与我们的认知有很大关系。
主语从句，从句缺少方式状语，故用How。
2.Where 句意：李白，中国伟大的诗人，出生的地方人人皆知，但是有些人对此并不接受。
主语从句，缺少地点状语，故用where。
3.when 句意：土豆被引入欧洲的确切时间不能确定，但很可能是在1565年左右。
主语从句，缺时间状语，故用when。
4.What 句意：我想告诉你的是我对父母深深的爱和敬重。
主语从句，从句缺宾语且指事物，故用what。
5.What 句意：影片中最打动我的是那位父亲对他儿子深厚的爱。
主语从句，从句缺主语且指事物，故用what。
6.What 句意：让这本书如此不同寻常的是作者创造性的想象力。
主语从句，从句缺主语且指事物，故用what。
7.Whichever 句意：你们之中不管是谁打破了窗户，都要赔偿。
主语从句，引导词限定后面的one，且表示在限定范围(you)中的任何一个，故用whichever。
8.whether 句意：新组成的委员会制定的政策是否能实施还有待观察。
题干中It是形式主语，空格处引导主语从句，故用whether。
9.What 句意：他那个自认为很不错的提议被老板在会上否决了。
主语从句，从句缺宾语且指事物，故填what。
10.Whatever 句意：——今天我请客，你有什么特别想吃的吗？——无论你选择什么对我来说都可以。
主语从句。
单项选择题1.C 【解析】考查主语从句。
helps是谓语，＂______________ you can do＂是主语部分，即主语从句，在主语从句中，do后缺少宾语，表示＂任何事情＂，因此用whatever引导，故选C。