what和what is有什么用法上的不同之处和相同之处?比如说：what color is i

what和what is有什么用法上的不同之处和相同之处?比如说：what color is i 关于what it is和what is it的用法 what color is your book 和 what color are you books 这两个句子的be what用法What did you say和what say did you 有什么区别?What day is it what is it?和what it is?有什么区别 what it is?和 what is it?有什么区别? what color is ()pen what color is this what color is it 在感叹句中,How 和What的用法有什么不同 例：---wonderful music it is.为什么用what而 关于date的用法What date is it today?和What'the date today?有什么区别?So What day is it today?和What day is today?的意思有什么不同?