difference between do and does?

Basic English Grammar – Do, Does, Did, Don’t, Doesn’t, Didn’t

“Does” is used for singular subjects like “he,” “she,” “it,” “this,” “that,” or “John.” “Do” is used to form imperative sentences, or commands. Example: Do your homework. “Does” is never used to form imperative sentences.

How & When to Use Do, Does and Did | Correct Use of Do / Does / Did – ChetChat English Grammar Tips