When somebody is knocking on the door, you respond with: "Who is it?". Why 'it', while you know it's a human being who is knocking on the door? Can you respond with: "Who is he/she?" Or even "Who are you?" as the Chinese do. Is it just a language habit or is there some logics behind it?
And when you pick up the phone and someone asks for you, you are supposed to responed with: "This is he." Why not "This is I."?
Top answer
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— Rishonly
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