by Alex Case » 16 Aug 2012, 10:34
There basically isn't a "use to" structure, it is only used in the negative and questions of "used to" sentences, and not similar structures like "get used to" and "be used to", e.g.
used to - didn't use to - Did you use to?
got used to - didn't get used to/ haven't got used to - Did you get used to?/ Have you got used to?
The additional difficulty is that "use to" and "used to" sound identical in rapid speech because (especially final) d and t are such similar sounds.