Whose is that shirt 那件衬衣是谁的?
(回答时用名词性物主代词,比如说it's mine.)
Whose shirt is that 那是谁的衬衣?
(回答则应该用形容词性物主代词,如it's my shirt.)
两句话都没错,表达的是同一个意思,只是表达的方式不一样,所以回答方式也不一样
Whose is this shirt?是可以写成Whose shirt is this?的,意思没变
这就象请求别人帮忙时可以说Can you help me?也可以说Can you give me a hand?句子虽不一样,但表达的意思是完全一样的,都是正确的.