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"her or him = hes" i know that instead of using his or her in correct grammer
"he or she"=?" what we can write instead of he or she? It can be? i mean i can write "it" instead of he or she
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Matthew.90"her or him = hes" i know that instead of using his or her in correct grammer
I don't understand what you mean. There is no such word as "hes". There is a word "he's", but I do not see any connection to your question.
Matthew.90
"he or she"=?" what we can write instead of he or she? It can be? i mean i can write "it" instead of he or she

A much debated question. Many people use a singular "they":

"This student thinks they can get by without any study."

Others are not completely happy with this usage, especially in more formal English.

You cannot use "it" when referring to a person (except very insultingly, or perhaps for a newborn baby).
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nope nope u didn't understand me. we dont know who he or she.Eg;we answer the door we say who is it? "IT can become he or she"
Matthew.90Eg;we answer the door we say who is it? "IT can become he or she"

In this instance, "it" is OK. However, its use is strictly limited to certain expressions, and it does not substitute grammmatically for "he or she". (For example, if someone knocks at the door you can't say "Who is he or she?") I'd classify it more as an idiom than a direct use of "it" to refer to a person of unknown sex.