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.


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.

  • 4
    Downvoted 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?"
    – Mari-Lou A
    Sep 26 '20 at 12:17
  • Ditto. This is clearly wrong and should not be accepted.
    – StephenS
    Sep 26 '20 at 18:03

"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.

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