疑问代词 :
表示“谁(who),谁 (whom),谁的(whose),什么(what), 哪个或哪些 (which)”等词叫疑问代词.
疑问代词的用法:
疑问代词用于特殊疑问句中,疑问代词一般放在句子的最前面,在句中可用作主语,宾语,表语,定语.
Who is here just now?
刚才谁来这儿?
Whom are you looking for?
你在找谁?
Whose exercise-book is this?
这是谁的练习本?
What is this?
这是什么?
Which one do you like, this one or that one?
你喜欢哪一个,这个还是那个?
疑问代词还可以引导一个间接疑问句,也就是一个从句.疑问代词在句中可用作从句的主语,宾语,表语等成分.
What we should do is still unknown.
我们该干什么仍然还不知道.
I know whom he is looking for.
我知道他在找谁.
连接代词
1. 连接代词的用法.连接代词主要包括who, whom, what, which, whose等,它们在句中可用作主语、宾语、表语、定语等,可以引导主语从句、宾语从句和表语从句：
引导主语从句：
Which side wins makes no difference to him. 哪边赢他都无所谓.
What he had hoped at last came true. 他希望的事最后实现了.
引导宾语从句：
Do you know who he is. 你知道他是谁吗?
I don’t know who he gave it to. 我不知道他把它给谁了.
He asked me what I wanted. 他问我想要什么.
I don’t know whose it is. 我不知道那是谁的.
I missed what you said because of the noise. 由于嘈杂我没听清你的话.
引导表语从句：
This is what I want to stress. 这是我想强调的.
That is what he meant. 这就是他的意思.
The question is whom we should trust. 问题是我们应当相信谁.
The question is which design is better. 问题是哪个设计更好.
2. what 的两种用法.what有时表示“什么”,带有疑问意味；有时表示“所…的一切事或东西”：
I don’t know what he wants. 我不知道他想要什么.
What he says is right. 他所说的是对的.
I believe what she told me. 我相信她和我所说的话.