1Nounclausesasthesubject[语法教学课件].pptVIP

知识必备 主语从句定义： 在主从复合句中，充当主语的从句叫主语从句 一、主语从句的连接词 1、连接词that和whether （1）that在句中不充当成分，仅起连接作用，但不能省略 That she was chosen made us very happy (2)whether在从句中不担任任何句子成分，意为“是否” Whether we will hold a party in the open air tomorrow depends on the whether. 一、主语从句的连接词 2、连接代词（who、whose、what、whatever等） eg：Who he is is not important. eg: What he told me was true. 3连接副词（when、where、how、why等） eg :When we will start off is an important question eg: Why John did it this way was unexpected. 二、主语从句中用it作形式主语的结构 A It + be+形容词（obvious、true、natural，etc）+ that-clause eg:It is certain that she will do well in her exam. B It +be+名词词组（no wonder、an honor，etc）+ that-clause eg:It’s no surprise that our team should have won the game. 二、主语从句中用it作形式主语的结构 C. It+be+过去分词（said、reported、proved，etc） + that-clause eg:It has been proved that what you said is right D. It+不及物动词（happen、seem、appear,etc） + that-clause eg: It seems that he has lost something. 主语从句的注意事项 1.从句的语序：在任何情况下，主语从句都用陈述语序。 Whichever of you gets here first will get the prize. How he succeeded is still a puzzle. 2.主谓一致 1）从句作主语，主句的谓语一般用单数形式；但what和who引导主语从句时，有时主句谓语的数应与主句中作表语的名词保持一致。 What they need are books. What they need is love. 主语从句的注意事项 2)如果由and连接两个或两个以上的主语从句时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。 When they will start and where they will go have not been decided yet. When and where the meeting will be held has not been decided. 主语从句的注意事项 3)whether引导的主语从句，如果用了形式主语it,引导词whether可以换成if。如果whether从句在句首或后面直接跟有or not时，不能用if 替换。 Whether they will sell the house is not yet decided. (此时whether与if不可互换) =It is not decided yet whether/if they will sell the house. (此时whether与if可互换) Unit 4 Astronomy: the science of the stars Learning about language Noun clauses as the subject life is beginning… We were born… We are growing up… mother For all these, we should give thanks to our mothers ---because they give us our lives! Try to sa