Is this sentence wrong?

2 is a proper question: "Why are you here?"

1 is not correct by itself. It might be correct as part of a sentence: "Tell me why you are here."

(1) is not a valid sentence. It is possible for those words to appear as part of a larger sentence; for example, "I don't know why you are here".

(2) is correct.

Then is this right ?
1.Tell me why are you here?
2.why you do here?

Carter Lee1. Why you are here.2. Why are you here?

It is easy to confuse these.

In a question, we switch the subject-verb order in a sentence.

The sky is blue.
Why is the sky blue?

In an indirect question, this does not happen. The subject-verb word order stays the same:
The teacher explained to us why the sky is blue

Carter LeeThen is this right ? Tell me why are you here?

This is right:
Tell me why are you here.

It is not a question, but a statement, so it ends with a period, not a question mark.

Thanks Sir,
But what if I use with auxillity verb like this, is this wrong?

Why you do here? Here is not including be verb.

What if we use do-auxillity verb in indirection question sentence? Also, I have a question this,

Why is the sky blue?-> Why the sky do blue?

Carter LeeThanks Sir, But what if I use with auxillity verb like this, is this wrong?Why you do here? Here is not including be verb.

"why you do here" is not a valid sequence of words, either as a sentence itself or as part of a larger sentence (ignoring certain special cases that would complicate things in an irrelevant way). Normally you cannot just "do"; yo

Carter LeeBut what if I use with auxillity verb like this, is this wrong?

If you have an auxiliary verb, do or have, you must also have a main verb.

Why you do here? There is no main verb here, so it is not correct.

Why do you work here? The main verb is "work." In questions, the auxiliary verb is i