who wants another drink?为什么是want要加s

who wants another drink?为什么是want要加s everybody wants you 这里为什么want要加s who wants to be a doctor?wants为什么要加s you want another drink? Mr Li wants me to join the swimming club.为什么want要加s? He wants me to ask you a question.want为什么要加s?不加可以吗? Who Wants to Drink What? Do you want another drink everybody wants to have lunch in the garden为什么want要加s.这个又不是三 somebody wants to see you,Jim.want为什么加s ,see为什么用原形 My mother wants me to drink more milk 请问为什么这里要加to啊? who want还是who wants