Have to, has to, had to

 

have tohas to in the Present Simple

PronounsAffirmative sentencesNegative sentencesQuestions
I, we, you, theyhave to go to work.do not have to  go to work.Do I have to  go to work?
he, she, itShe has to go to work.She does not have to  go to work.Does she have to  go to work?

had to in the Past Simple

PronounsAffirmative sentencesNegative sentencesQuestions
I, he, she, it, we, you, theyhad to  go to work.did not have to  go to work.Did I have to  go to work?