have to / don’t have to
We always use the base form of the verb after have to / don’t have to.
[latex]\color{limegreen}{\checkmark}[/latex] He has to tidy his room today.
✗ He has to tidied his room today.
✗ He has to tidying his room today.
We use the correct form of do + not/n’t + have to to say that something isn’t necessary. We don’t use haven’t to.
[latex]\color{limegreen}{\checkmark}[/latex] You don’t have to help me. I can do it.
✗ You haven’t to help me. I can do it.
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