"Did used to" vs. "did use to" [duplicate]
The use of "used to" is much more frequent than "use to", but what about "did used to" vs. "did use to"?
Solution 1:
I think did use to is correct. Confusion over whether to use the form used to or use to, arises because the pronunciation seems the same in both cases.
Except in negatives and questions, the correct form is used to.However, in negatives and questions using the auxiliary verb do, the correct form is use to, because the form of the verb required is the infinitive.
So, i think did use to would be the correct one to use.