Who makes breakfast in your family?My mother does.为什么是用does,

Who makes breakfast in your family?My mother does.为什么是用does?
does是一个代表“一般现在时态第三人称单数”的助动词,代替“makes breakfast in your family”,不能直接用makes或别的词代替；如果是过去时态,简略回答时就要用did.如Who made it for you?Li Ping did.如果是将来时态,简略回答就用wiil do.如：Who will go home this afternoon?I wiil do.