Whom/Who does the bike belong to?为什么是does不是is?

Whom/Who does the bike belong to?为什么是does不是is? who does the watch belong to正确吗?为什么不能用whom? who does the yellow backpack belong to?这句有没有语法错误?为什么Who 不是wh 想知道是who does this book belong to?还是whom does this book belon 这句话为什么用who 不用whom啊 .who does this book belong to? ＿＿＿does this new bike belong to?A who B whose C who's D whom Whom does me belong to? Who does it belong to? 为什么是That does not belong to me 而不是That is not belong to me 为什么不能用who does it belong to Who does this watch（belong）to? 1,who does this coat belong to?