When I was a child I didn't use to behave naughtily.
There didn't use to be any tree on this hill.
There didn't use to be any computer thirty years ago.
Fifteen years ago students didn't use to go to internet cafe to study their lessons.
There didn't use to be any traffic problem in Istanbul twenty years ago.
He didn't use to smoke last year.
There didn't use to be any bedsteads in my village when I became a primary school teacher, but now there is one or two bedsteads in every house.