Illustrative Examples. He attends lectures and seminars

He attends lectures and seminars.

Does he attend lectures and seminars?

Yes, he does. No, he doesn’t.

He doesn’t attend lectures and seminars.

What does he attend?

He attends lectures and seminars.

Who attends lectures and seminars?

He (she) attends lectures and seminars.

The Present Indefinite Tense
Affirmative +	I (you, we, they) study V
He (she, it) studies V (es)
Interrogative ?	Do I (you, we, they) study? Do …. V?
Does he (she, it) study? Does …. V(es)?
Negative	I (you, we, they) do not don’t study do not V
He (she, it) does not (doesn’t) study does not V(es)