The confusion between ‘কি’ (Ki) and ‘কী’ (Kee) is one of the most common errors in written Bengali. While they sound identical, their grammatical functions are distinct and depend entirely on the expected answer.

The Golden Rule:

• ‘কি’ (Short ‘i’): Used for questions that can be answered with a simple ‘Yes’ or ‘No’. For example: “Tumi ki khabe?” (Will you eat?). Here, it acts as a particle or conjunction.
• ‘কী’ (Long ‘ee’): Used for open-ended questions that require a descriptive answer or a specific noun. For example: “Tumi kee khabe?” (What will you eat?). In this case, it functions as a noun or pronoun.

By mastering this simple ‘Yes/No’ vs ‘Descriptive’ logic, you can ensure your Bengali writing is both accurate and professional. Never let a tiny vowel change the entire meaning of your sentence again!