1、选择性必修一 Unit5 主语从句一点点心动老师 2022-12-7一 知道基本定义：什么是主语从句？答：在英语中，有的从句在复合句中的作用相当于名词，称作名词性从句。在复合句中用作主语的从句叫名词性从句。主语从句放在复合句中要用陈述句的语序。二 知道引导词有哪些问：主语从句有哪些引导词？答：引导主语从句的词有连词that,whether,(不能用if)连接代词who,what,which 连接副词when,where,how,why whoever,whatever,whichever;等三 知道形式主语 问：主语从句太长怎么办？答：为了避免主语显得过长，可以用it 作句子的形式主语，把主语
2、从句移到句子的末尾。知道形式主语：It is uncertain that the experiment is worth doing.注解：一般来说主语从句都是放在注解：一般来说主语从句都是放在 ,但有时为了使句子但有时为了使句子 ,避免避免”头重脚轻头重脚轻”,常用常用 it 作作 ，从而把主语从句放在，从而把主语从句放在 句尾句尾 句首句首保持平衡保持平衡 it 形式主语形式主语后面后面 It is uncertain whether the experiment is worth doing.四 弄懂连接词that,whether 和if连词that 本身无意义，有时可省略。wheth
3、er和if本身有意义，均不能省略。that和whether可以连接所有的名词性从句。而if引导名词性从句时，主要引导宾语从句或不在句首的主语从句。If可引导表语从句从句，但是少见。whether可以做介词宾语，if则不能。whether引导的句子可以放在复合句的句首，if引导的从句只能放在主句谓语动词后面。引导宾语从句时，If和whether可以互换，在口语中多用if。但是宾语从句位于主句之前时，只能用weather。Whether后可以接不定式，而if不能接不定式。五 连接词 whether 和if的区别If 和whether常在see,ask,try,wonder,know 等动词后面。连
4、接词that,whether 和if 在句中只起到连接作用，不充当任何句子成分。That he will not come to the meeting this evening is true.Whether the meeting will be put off has not been decided yet._ she is coming or not doesnt matter too much._ they will have the sports meet is still a question.Whether Yuan Longping could succeed was un
5、known at that time.It was doubtful _Tom really saw Mary.主语从句位于句首，只能用主语从句位于句首，只能用whether引导；引导；但如果用但如果用it作形式主语，作形式主语，二把主从放在句末，也可以用二把主从放在句末，也可以用if引导。引导。_we will go for an outing tomorrow remains unknown.whether if Whether/WhereWhetherWhen/Where/Whether六 弄懂连接代词在英语语法中。有连接代词，连接副词和关系代词，关系代词之分。连接代词和连接副词引导名词
6、性从句有主语从句、表语从句、宾语从句、同位语从句。关系代词和关系副词引导定语从句。连接代词在句中既起连接作用，同时又充当主语、宾语、定语、表语等成分。Who was responsible for the accident is not yet clear.在这个句子中，who 既引导主语从句同时又作从句的主语。This is what he said to me.在这个句子中，what 既要引导表语从句，又要作从句的宾语。he said sth to me,缺sth,即缺宾语。用连接代词。相通的句子：It doesnt matter _what_ she looks like._wants
7、to stay in a hotel has to pay their own way.A.Anyone B.The one C.Whoever D.Who翻译句子：任何想要呆在旅馆中的人不得不按自己的方式支付。这是主语从句。_wants to stay in a hotel这个句子本身还少主语，因此用连接代词whoerver,=anyone who,这样就变成了定语从句修饰anyone。因此可以知道，选anyone,the one,who 都无法表达完整意思。注意who=anyone who/the person who what=anything/all/something that wh
8、atever=anything that whoever=anyone who/those who whichever=anyone who/any one which/thatwhomever=anyone who/whomwhosever=anyone whose/anything that 经典例句：1 Whoever is responsible for this will be published.对此事负有责任的人都将受到惩罚。用一个whoever,有表达任何一个相关人员的意思。注意：引导名词性从句的连接副词具备这样的特性，同学们可要记牢呀。when=the time when 什
9、么时候；何时where=the place where 什么地方；何地how=the way in which 如何；怎样why=the reason why 为什么发现规律：是不是替换成定语从句的结构啦！而在定语从句中，when，where，why 都是关系副词啦，不能称为连接副词。注意区分：All what she said is ture.错误 What she said is ture.正确 主语从句 All that she said is ture.正确 定语从句注意区分：How is he going to do it is a mystery.错误How he is going to do it is a mystery.正确It doesnt matter+how/whether 结构中主语从句不能提前It doesnt matter whether he likes it or not.正确Whether he likes it or not doesnt matter.错误 Thank you!
