Which sentence correctly uses the auxiliary "does"?

Correct answer: A. He doesn't know the answer.

With a third-person singular subject, the auxiliary is "does", and the main verb stays in its base form: "He doesn't know the answer."

easy

Answer and explanation

The correct answer is A. He doesn't know the answer.

With a third-person singular subject, the auxiliary is "does", and the main verb stays in its base form: "He doesn't know the answer."