Affirmative:
I study
You study
He/She study
It study
We study
They study

Negative:
I do not study
You do not study
He/She does not study
It does not study
We do not study
They do no study

Interrogative:
Do I study?
Do you study?
Does he/she study?
Does it study?
Do we study?
Do they study?

Espero ter ajudado. Qualquer dúvida me avise.