'I didn't used to' has no logical justification, but I see it increasingly in print. I don't recommend that you use it but, if you do, many people will not notice the 'error'.
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goronskyI don't know how reliable this guy (Bryan Garner) is,http://en.wikipedia.org/wiki/Geoffrey_K._Pullum has written of a chapter by Garner in the Chicago manual of style "His chapter is unfortunately full of repetitions of stupidities of the past tradition in Eng