who is this和who is that怎麼回答?

who is that和who's this who is this和who is that有什么区别? who is that speaking?为什么回答是This is...speaking Who is that speaking 回答用this 还是that who is that和who is it who is that?如何回答 who is she和 who is that有什么区别,如何回答 Who is this?一般怎么回答? This is John speaking.Who's that? this is me that/who love him. who is that boy?怎么回答? who is this 或Who is that的回答可以用she is 或he is吗还是必须用this is 或th