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I am in confused that When I ask to unknown person, then how to ask: Who are you? or Who you are..

Other examples: What is he doing? or what he is doing.. How are you? or how you are..

What is the reason behind that? In which condition we use them separately ?

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    "Who you are" isn't a question. Or even a complete sentence.
    – Hot Licks
    Mar 31, 2019 at 13:48

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Who are you?

The above is a question. It employs an inverted structure so that the listener knows it's a question. By "inverted structure," I mean that it places the primary subject of the noun "are" after the verb. Uninverted, it would be: "You are who?" "Who" appears in the question—no matter how it's stated—as a second subject, as part of the predicate, specifically the predicate nominative.

who you are

The above is a clause, always appearing as all or part of a noun clause. As such, it only appears as part of a larger sentence, for example:

  • It depends on who you are.
  • I don't know who you are anymore!
  • You want to know who you are? Who you are is the love of my life.
  • Who you are to everyone else doesn't matter to me because it's not who you are to me.
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