5.6 USED TO

Used to refers to past habits and states which were true in the past but are not true any more. It can be used with both action verbs and state verbs:

On Sundays, my parents used to take me to dance school. (habit, action verb)
I used to hate dancing in those days. (state, state verb)

The negative and interrogative forms of used to are:

I didn't use to like dancing in those days.
Why did you use to hate dancing?

Used to + infinitive should not be confused with be/get used to + gerund (verb-ing):

She used to live alone in a small apartment. (it was true in the past, but not any more)
She was used to living alone in a small apartment. (she was accustomed to it)
She got used to living alone in a small apartment. (she became accustomed to it)