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Recently I was been posted with this question: Why is
1. I don't know who is he. (grammatically incorrect)
2. I don't know who he is. (grammatically correct)
Even as a native English speaker, I could not give the person asking this question a definite answer or explanation. Please enlighten me on this. Thanks!

1 Answers1

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"Who is he" can only be a complete sentence, whereas "who he is" can only be a clause embedded in another sentence. In English where there is little conjugation, word order is more heavily relied upon to make that kind of distinction, so this shows up a lot.