Seeking to understand "why you are here" [closed]

Is this grammatically correct sentence or not? I have often heard people using that sentence. I know 'Why are you here?' is perfect but I think the one which I have mentioned above is correct only in spoken English. Any suggestion would be appreciated.

Clarification from comment: I have heard

"Just tell me one thing why you are here and why you are learning English."

No

According to this page, initial auxiliary words or verbs never come after the initial subject in questions.

"Why you are here?" I have often heard people using that sentence. [For example:] "Just tell me [...] why you are here and why you are learning English?"

I will explain this step by step, but with "he" instead of "you", to make things clearer. First, we have the normal sentence order for a statement:

He is here.

Now, if you want to transform that into a question, you have to invert the order of the subject and the verb. In other words, the subject and the verb have to change places:

Is he here?

Why is he here?

Now let's look at what happens in indirect speech:

I asked you if he is here.

I asked you why he is here.

I told you why he is here.

That is different from a direct quote:

I asked you, "Why is he here?"

So, if a person says, "Tell me why you are here and why you are learning English," that is indirect speech.

It's not grammatically correct.

Such a sentence is known as an interrogative sentence. As such, it should start with:

• A "5W1H" word (who, what, where, when, why, how); OR
• a conjugation of one the three verbs "be", "do" or "have", e.g. "are", "does"; OR
• a modal verb such as "may", "might", "can", etc.