what引导的是主语从句、宾语从句或表语从句,并且在从句中充当主语或宾语.如：
I like what she likes.（what引导宾语从句,what在从句中作宾语）
I hate what she hates.（what引导宾语从句,what在从句中作宾语）
What she said made us surprised.（what引导主语从句,what在从句中作宾语）
Tell me what made you do that.(what引导宾语从句,what在从句中作主语）
This is what I like.（what引导表语从句,what在从句中作宾语）