Where is it 和Where it is有什么区别，IS 和it分别怎样使用

where is it 是一般的问句,,在问句时使用,例如,l:I found your bag.2: where is it?
where it is 是句中的一部分..例如 I lost my handbag and I don't know where it is.

一个是独立问句的格式，一个是必须依附于主句的从句
IS 是联系动词
而it代词
就这么简单

Where is it 是它在哪
Where it is 是上句的从句表示。
例：
A:Do you know where it is?
B:I don't know.
——————————————
A:Where is it?
B:It's here.