USED TO

Affirmative:

S+used to+V+C

EXAMPLE:

my uncle used to listen to reggae music

Interrogative:

aux past+S+use to+V.S+complement+?

EXAMPLE.

what did you use to three years ago?

Negative:

S+didn`t+use to+V.S+C

I didn`t use to drive car

http://www.youtube.com/watch?v=ulezklvGaQk