这有人问过...譬如指着相片问

因为他是用it来问不是用he来问，这初中就讲过呀，下面的it只能指动物或者事物我就不知道了学习啦

it在这里做代词，代指问题中提及的"son"，而且it并不是只能指代物件和动物，也能指代前面所提到过的人，物，事情等。实在不懂建议你还是去搜一下it的具体用法。如上

教材很多都是傻子编的

It是万能词，可特制大家心目中知道的人，物，事

点我kan片jb

"it" can be used of people in sentences such as:
ANN (on the phone): Who is that/Who is it?
BILL: It's me.
Is that Tom over there? ~ No, it's Peter.
(Source: Practical English Grammar)
"it" used to identify
We use "it" for a person when we are identifying him or her.
e.g. Who's that over there? ~ It's John Cook. (NOT He's John Cook.)
e.g. Is that our waiter? ~ No, it isn't. (NOT No, he isn't.)
(Source: Practical English Usage)

小婴儿一般用it