1人同问 Is this/that your sister 的答语是Yes,it is./ No,it isn’t 为什

Is this/that your sister 的答语是Yes,it is./ No,it isn’t 为什么要用it 而不是she
英语中对性别不详或身份不能够确定的人（特别是婴幼儿）常用It代指,而不用he或she代指,这是一种语言习惯.再如：Who is that (at the door)?It's me.谁在敲门?是我.