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is it a boy or a girl

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is it a boy or a girl
不是it不指的,为什么这里能用IT
is it a boy or a girl
不确定或未知的人,一律用it
顺便说一下it作代词的用法.
1代替this,that.如 -- What’s this/that?– It’s a map.
2代替上文提到的单数事物.如 My pen is lost,and I can’t find it.
注:区别it和one:it是代替特指的事物,one是代替泛指的事物.如 My pen is lost.Have you seen it?(特指) / My pen is lost.Do you have one?(泛指)
3代替未知的人.如 Is it a man or a woman?
4代替小孩,尤指婴儿.如 She had a baby yesterday.It has only two kilogrammes.
5代替距离、天气、时间、日期或季节.如 It’s a long way from here to my school./
It’s cold today./ It’s 8:10 now./ It’s August 23/ (Monday)./ It’s winter now.