I ask my teacher is it right to say "it is a brain" or "this is a brain"? He answer me you can say both and I search google and found the same answer that both are correct. But I have some cockroaches in my brain that it should not be this and it at the same time.
2 Answers
Logically as a programmer you can use your awesome brain, the brain is a living organ which is listening your commands and performing through your blood. You can only say a living organ with command THIS until this is alive. You can't say or call a dead brain with command THIS but you call it with command it.
Call Living Brain This.
Call Dead Brain it.
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4Downvoted because iti[the answer] is absolutely wrong. What is it? "It" may refer to any inanimate thing, or any living or dead creature. It is less common to ask "What is this?" Sep 26, 2020 at 12:17
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"What is the organ shown in this picture?" "It is a brain."
"What organs do these pictures show?" "This is a brain, and this is a heart."
We use it to refer to something already identified, and this or that to identify something.