This question is a perennial favourite. If you search the Internet you will find lots of opinions. Mine, which others may not share, is that both forms are horrible, especially written down.
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burgasglarus I know "used to" is special. Which of the following is correct use of its negative?Say 'She didn't smoke (at that time)'.
She didn't use to smoke or She didn't used to smoke.
Could it be that both are correct? No. both are wrong
Anonymous"In writing, I advocate "She used not to smoke". not goodShe used to not smoke. better"She used not to smoke" is actually the formally correct way of saying it in British English. It seems that "used not to" may not be familiar in AmE, which I wasn't aware of -- which suprises me a little given the frequency with which this question crops up.
Anonymous I much prefer 'used to not'. "used not to" seems 'backwards' and 'unfinished'.Where are you from?
BarbaraPAI didn't use to.You didn't use to.He didn't use to.We didn't use toThey didn't uses to.These are all typical in the American dialect."didn't uses to" really??