原句感知 自主探究 ①The possibility that pleasant smells might reduce pain has recently been suggested by new research.

②Since it is believed that strong smells can affect the senses, volunteers were required not to eat or drink for eight hours before the experiment.

③Scientists are interested in whether the sense of smell is related to pain.

④He says that scientists have already collected data from 40 volunteers.

⑤When we'll hold the sports meeting has not been decided yet.　　

⑥The fact that Great Britain is made up of three countries is still unknown to many people.

⑦My parents' wish is that I can go to a key university.

⑧They are discussing the problem whether they should ban (禁止) fishing in the lake.

⑨It is not clear whether she will attend his wedding.

⑩I have no idea when he would return. (1)以上句子中②⑤⑨的加黑部分引导的是主语从句；③④句中加黑部分引导的是宾语从句；⑦句中加黑部分引导的是表语从句；①⑥⑧⑩句中加黑部分引导的是同位语从句。

(2)①②⑥⑦句中的that不能省略。 　　

　　[语法剖析]

　　名词性从句在句子中起名词的作用。在句中作主语、表语、宾语和同位语，分别称作：主语从句、表语从句、宾语从句和同位语从句。学习名词性从句主要应注意其连接词的用法与区别以及名词性从句与其他从句的区别等。

　　名词性从句的连接词

分类 词形 词义 作从句的成分 从属

连词 that whether/if 是否 连接

代词 who(ever) (无论)谁[主格] 主语、宾语、表语 whom(ever) (无论)谁[宾格] 宾语 whose 谁的[所有格] 定语 which(ever) (无论)哪一个(些) 主语、宾语表语、定语 what(ever) (无论)什么，......东西 主语、宾语、表语、定语 连接

副词 when 什么时间 状语 where 什么地方 状语 how 怎样，如何 状语 why 为什么 状语