英语语法高手们请进

what 不引导定语从句也不引导状语从句.
why 引导定语从句但不引导状语从句.它引导定语从句时先行词是the reason
The reason why he didn't go to school is that he was ill.
where这俩种从句都能引导,定语从句要放在名词或代词的后面,表示什么样的人或物.状语从句要放在主句前或后表示主句动作发生的地点.
This is the city where Tom was born.(定语从句)
I found my book where I lost it.(状语从句)

什么\哪里\为什么
what
[hwɔt]
pron.
(用以询问某人或某事物的词) 什么, 多少
What is the price?
价钱多少?
…的事物
This dictionary is just what I want for my study.
这部词典正是我学习要用的工具。
adj.
…的(事物或人)
What colour is it?
它是什么颜色的?
adv.
(用于感叹句中)
What genius he has!
他真有才华！
int.
(用以表示不相信或惊奇)
What, do you really mean it?
什么, 你真是这个意思?
(用以表示未听清楚对方说的话)
What?Can you say that again?
什么?你能再说一遍吗?

where
[hwɛə]
adv.
在哪里, 到哪里, 在什么位置
在…(地方); 到…(地方)
This is the house where the great man was born.
这所房子便是那位伟