Let's first have a look at the structure of the Used-To Structure in terms of the various grammatical moods (indicative, interrogative, imperative) and in terms of polarity (positive and negative).
|indicative||They used to smoke|
|interrogative||Did she use to work?|
|indicative (1)||We did not use to travel.|
|indicative (2)||I used not to care.|
|indicative contracted (1)||He didn't use to cook.|
|indicative contracted (2)||They usedn't to watch.|
|interrogative||Did you not use to drive?|
|interrogative contracted||Didn't she use to swim?|
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