whose is the new car red over there ?
非疑问句一般是要加的吧,谁的 后面总要有些名词性质的 词,除非像这种,上下文已经给出暗示,但是那是省略,不是不用加,而是省略了(好像我初中老师是这么教的吧)。比如
'It wasn't your fault, John.' — 'Whose, then?'.(省略 fault)
That kind of person likes to spend money, it doesn't matter whose it is.(money)