"I used not to smoke when I was a teenager" or "I didn't use to smoke when I was a teenager" ?
Which is correct and why ?
[1] I used not to smoke when I was a teenager. [2] I didn't use to smoke when I was a teenager . Both are OK and have the same meaning, though [2] is much more common, especially with younger speakers I believe.
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[1] I used not to smoke when I was a teenager.
[2] I didn't use to smoke when I was a teenager.
Both are OK and have the same meaning, though [2] is much more common, especially with younger speakers I believe.
Grammatically, the difference is that in [1] "used" is an auxiliary verb, while in [2] it's a lexical verb as can be seen from the fact that it has suppo