Whose guitar is this?类似于这种的疑问句怎么回答?

这种问题是针对主语提问,是所属关系,所以,有1。whose guitar is this?物为可数名词单数,回答用it来代替,be动词用is：it is one’s。（one’s为某人的,如his）2。whose guitars are those?物为可数名词复数,回答用they来代替,be动词用are：they are one’s。（one’s为某人的,如his）3。whose bread is this?物为不可数名词,回答用it来代替,be动词用：is：it is one’s。（one’s为某人的,如his）