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Help the college student write a funny email to her mom about how much she has changed.
Before college, I _________________________ drink coffee at all. Now, I can't survive an 8 AM lecture without it! I also _________________________ care about getting enough sleep, but a good nap is my favorite hobby these days.
Before college, I didn't use to drink coffee at all.
In negative sentences, we use "didn't" (did not). Because "did" is already in the past tense, the main verb drops the "d" and becomes "use to".
I also didn't use to care about getting enough sleep...
Remember the formula for negative past habits: Subject + didn't use to + base verb. Plausible-sounding options like "didn't used to" are grammatically incorrect in standard English!