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1、【命题解读】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。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。【命题预测】预计今后高考对名词性从句的考查仍然不会单纯地考查其语法结构，而是将其融入一定的语境中来考查考生的实际综合运用能力。【复习建议】1. 掌握宾语从句的用法；2. 了解同位语从句的用法；3. 掌握表语从句的用法；4. 掌握主语从句的用法；5. 如何正确选择引导词。主语从句主语从句是在复合句中担任主语的句子。其
2、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if That 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
3、有： It 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。 It is名词词组(no wonder，an honour，a good thing，a pity，no surprise，common knowledge，a surprise， a fact，etc)that.Its a pity that we cant go 很遗憾我们不能去。It is过去分词(said，reported，thought，expected，decided，announced，arranged，etc)that.It
4、 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。It 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。It doesnt matter that.|It makes no difference that
5、.It doesnt 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！经典解析 1.（2020.江苏卷.单项填空）It is not a prob
6、lem _ we can win the battle; its just a matter of time.A. whetherB. whyC. whenD. where【答案】A【解析】考查主语从句。句意:我们能否打赢这场战斗不是问题；这只是时间问题。A. whether是否；B. why为什么；C. when什么时候；D. where在哪里。根据下文its just a matter of time可知，此处指”我们能否打赢这场战斗不是问题”，it是形式主语，whether引导的从句是真正的主语。故选A。2. (2018天津卷单项填空)The gold medal will be awa
7、rded _to wins the first place in the bicycle race.A. whomever B. whereverC. whoever D. whatever【参考答案】C【答案解析】考查名词性从句连接词。句意：无论谁获得自行车比赛第一名，金牌将授予他。分析句子可知，宾语从句中缺少主语，故用whoever，表示“任何人，无论谁”。故选C。3.Every year, _ makes the most beautiful kite will win a prize in the Kite Festival.A. whatever B. whoever C. whom
8、ever D. whichever【参考答案】B【答案解析】考查主语从句。分析句子结构可知，_ makes the most beautiful kite作主语，且所填词指人，既作从句的主语又作主句的主语，所以选 whoever(whomever不能作主语)。句意：每年， 在风筝节上风筝做得最漂亮的人都会赢得奖品。4.It is often the case _ anything is possible for those who hang on to hope.A. whyB. whatC. asD. that【参考答案】D【答案解析】考查主语从句。本句中it是形式主语，真正的主语是连接词t
9、hat引导的主语从句，连接词that在本句中不充当任何成分，只是一个引导词而已，不能省略。连接副词why要在句中作状语，连接代词what通常在句中作主语、宾语或表语等；as通常不引导名词性从句。句意：对于那些心存希望的人一切皆可能是事实。故D正确。【归纳总结】主语从句的规律规律一、主语从句一律用陈述语序，即主语在前，谓语在后。例1.When will he come is not known.正：When he will come is not known.规律二、连词that 在从句中无实际意义，但不能省略。例2. He will not come to the meeting this e
10、vening is true.正：That he will not come to the meeting this evening is true.规律三、whether 可以引导主语从句，放在句首，但if不能例3. If the meeting will be put off has not been decided yet.正： Whether the meeting will be put off has not been decided yet.规律四、主语从句的谓语动词多用单数第三人称形式。例4. When he will come are a puzzle.正：When he will come is a puzzle.