Whose 可针对my,your,our,their等形容词性物主代词提问,其语序为:
That is his shirt.那是他的衬衫
Whose shirt is that?那是谁的衬衫?
(针对定语提问)
whose 也可针对mine,yours,ours,theirs,Kate’s等名词性物主代词或名词所有格提问.
That shirt is his.那件衬衫是他的.
Whose is that shirt?那件衬衫是谁的?
(针对表语提问)
补充的问题
如果没有前后句,你这样写是没有错误的.主要是this指比较近距离的,而it是没有远近之分的.而在回答“this”和“that”作主语的疑问句时,常用“it”代替“this”和“that”.