Unit2 Witnessing time 名词性从句名词性从句: 即指性质相当于名词的从句，它包括主语从句、宾语从句、表语从句和同位语从句
一、引导名词性从句的连接词 连接代词：who, whom, whose, what, which, whoever, whatever, whichever 连接副词：when, where, how, why, whenever, wherever, however连接词：whether, if “是否”不充当句子的任何成分
that 只能起连接主句和从句的作用，不充当从句的任何成分，无词义
二、名词性从句的分类1
主语从句：用作主语的从句叫主语从句
That she likes such kind of films is very interesting
Whether he will come remains a question
What she is doing is none of your business
Whoever comes will be welcome
Where he has been is still a puzzle
However you do it is all right with me
表语从句：表语从句在句中作表语，它位于主句的系动词之后
The problem is that smokers cannot go without smoking
问题是抽烟的人不抽烟就会感到难受
The question is whether it is worth doing
问题是这是否值得做
China is no longer what it used to be
中国已不是从前那个样子了
This is where he has worked for years
