What you free today?为什么前面要用what

What you free today?为什么前面要用what what does the coat cost?为什么前面用WHAT? what do you have today? what are you wearing today? what have you done today what's eating you today? what did you do today? Can you explain what is free speech? 1、-What do you [ ] your free time? what were you doing ____noon today 空格用什么 what color are you wearing today?用英文怎么回答? if you feel what i feel 中间的那个what是什么意思,为什么要用what,what怎么用?