whose jacket it is ??

whose jacket it is ? 是错的。因为特殊疑问句是特殊疑问词+一般疑问句，而it is 是陈述句语序。

whose jacket is it ? 和whose is this jacket? 都对。因为 whose既是疑问形容词又是疑问代词。

当为疑问形容词,It is his jacket.这句话就his提问时，答案就是whose jacket is it ? 因为adj. 是用于修饰n.的，所以提问时是整体提问，又如 What colour is it? (what 此处为疑问形容词)

当为疑问代词，This jacket is his.这句话就his提问时， 答案就是whose is this jacket? 因为特殊疑问句=特殊疑问词+一般疑问句。又如 What is your name?
(what 此处为疑问代词)

Whose jacket is it? 是对的.

把它翻成叙述句就好理解了. it's whose jacket

whose jacket is it ? 是对的
就如who am i? who are you?

第二个对

显然是第一个对
第二句在这种情况下用I dont know whose jacket it is.
第三句应该是Whose jacket is this?

第一个是对的 这是一般疑问句 要到装