Should I use “have” or “has” in this question?
Does she have to go to school?
or
Does she has to go to school?
If I should use “have”, then what is the rule which makes me not use “has” here?
Answer
Does is the inflected verb here. It has the s because it is third person singular present. It is followed by the present infinitive, have which is invariant by definition of infinite in this context. It does not change with number or gender of the subject or tense of the modal verb.
Attribution
Source : Link , Question Author : Dims , Answer Author : David Robinson
