连接代词:
疑问代词在引起从句时，都称为连接代词，包括who, whom, whose, what, which, whoever,whomever, whichever, whatever。
即除了whose后不能加“-ever”后缀，其余都行。
例： I don't know who she is.
I don’t know when he will come.
连接代词引起从句：
a.主语从句：
It hasn’t been announced who won the prizes.还没宣布谁获奖。
It is clear enough what she meant. 她是什么意思很清楚。
b.宾语从句：
I don’t care what they think. 他们怎么想我不管。
Ask her which he wants. 问她要哪一个。
c.表语从句：
The question is who(m) we should trust.问题是我们应当相信谁。
What I want to know is which road we should take.我想知道的是我们应走哪条路。
d.状语从句
Wherever you go, whatever you do, I will be right here waiting for you.无论你去哪里，无论你做了什么，我都会在这里等你。
e.连代词还可引起不定式，都用作宾语或介词的宾语：
Tell him what to do. 告诉他怎样做。
Lucy can’t decide which to choose. 露西不能决定选哪个好。
They exchanged views on the question of whom to elect. 他们就该选谁的问题交换了意见。