The verb "use" used to be, well, used (maybe I should start this post over...).
Nowadays I can't say "I use to go to ballet classes 4 times a week", meaning "I do this habitually", although I could have said that from about 1400-1700 (not that I was dancing back then, though some mornings it feels like it). (The title of this post is not a mistake, but me being intentionally -- all right, you can say pretentiously -- archaic.)
This sense of "use" now occurs only in the past tense: "I used to go to ballet classes". In speech, this sounds exactly like the noun "use" plus "to" (YOOSS too). From this arise two problems:
1) Do not write "I use to", even though it sounds like that. Remember, "used" is in the past tense.
2) When you put this in the negative, you DON'T write "used". "I didn't use to go to ballet classes" is correct. It looks weird, but that's the correct version. Just as you wouldn't say "I didn't wanted to go", you can't say "I didn't used to go". "Didn't used to" is an extraordinarily common mistake, but it is a mistake nonetheless.
Hi:) Another problem with /used to/ is that learners think it is used to indicate past habits only because of the verb inflection /use-used-used/. Advanced ESL learners grasp the concept with ease, but lower level learners get quite confused. I enjoy teaching it, though. Oh, here's the other one, try it in the passive -- this just gets better and better:)
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