Can't I say "Why he is here?" instead?
Native speaker’s answer
Rebecca
No, in this case it would not be grammatically correct to ask "why he is here?" instead of "why is he here?". This is because "is" must come before "he" in this case to link the question particle with the pronoun. "Is" must always follow "why" and other question words. Ex: Why is she so tired? Ex: Where is the food?