usually, used to, use to

Usually (brukar) används för att beskriva något som vanligtvis händer.
Ex. 1: I usually wake up at seven o'clock. I do it to be in time for work.
Ex. 2: We usually go to the Alps every winter to ski.

Used to (brukade) används för att beskriva något som vanligtvis hände i det förflutna.
Ex. 1: I used to wake up at 10 o'clock every morning but now I wake up at 7 o'clock.
Ex. 2: In the 2010s we used to go to Aspen, Colorado, every winter to ski. Now we go to the Alps instead.

Used to ersätts ofta med did + use to i frågor och negationer som innehåller did.
Ex. 1: Did you use to wake up at 10 o'clock when you were unemployed?
Ex. 2: Back in the 90s, we didn't use to go skiing at all.