All OK to me. don't need to is more common than needn't . Also common is don't have to .
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pructusMichael Swan says c.is wrong.Hmm. I wonder what subtle point he's trying to make.
pructusThese modal forms of need normally refer to immediate necessity. They are often used to ask for or give permission - usually permission not to do something. They are not used to talk about habitual, general necessity.Thanks, pructus, for providing all this information. I thought that's what M.S. might have meant, but I don't think people follow those