কোনটি বাক্যটি শুদ্ধ?

Why you have done this?

Why did you have done this?

Why have you done this?

Why you had done this?

Explanation:

Correct Answer is: Why have you done this?
সাধারণ নিয়ম নিম্নরূপ: WH word + have/has + Subject + মূল্য verb এর past participle + extension

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