I am puzzled!1.Is this Jim?No, he isn't.2.Is this your sister?No, it isn't.The two dialogues appear in our American-edited English book,so I wonder why “he” is used in the first dialogue, but “it“ in the second?
热心网友
只有当提问人无法确定被提问对象的身份时候才这样用我有免费英文资料下载，可以去看看，单击我的名字（雪花啤酒）就可以看到。谢谢！
热心网友
In American English, "it" and "he/she/I" usage can be confusing sometimes for people who are not familiar with that。 Two dialogues refer to the similar situation and they are correct。 It is not a dramatic difference between those two。 For example, when you call someone on the phone, you don't say "Who are you?" instead you say "Who is this?" When you answer the phone, you say "this is Mary", but you don't say "I am Mary"。 Therefore, "it/that/this" can use it to describe "he/she/I"。
热心网友
其实没有什么区别