What spelling do you use in the following sentences?
NB For the purposes of grammar, please answer with what you would say (i.e. I'm looking for best written approximation of spoken English, not "standard written English" answers).
Also, I see that the "When it started out" sentence is not a good example; please disregard the exact wording and choose what you would use for the negative of "used to". (Can anyone suggest a good example? "When we were kids, we didn't used to have this sort of thing", perhaps? I can't think of a good example off the top of my head.)
And in general, I'm not asking whether you'd use the exact wording in a given sentence, but trying to elicit which form of "used to" you'd use in a given situation.
When I was young, I ________ go sledding every winter
"I hate the cold weather here." "That's because you're not ________ it."
"This tool was most often _________ open cans, when there was no can-opener around."
"This program is really bad." "Was it always that way?" "Well, it _________ be better at one point, but it got worse very quickyl."
"When it started out, it ___________ suck this badly."