Question

"She used to like blue."

In that sentence, what is used classified as? Is it an adverb because it is indicative of time?

Thanks for taking the time to read the question, I hope someone has got the answer!

Answer 1

"used to" is what is called a modal verb form (like could or should) and is acting the role as part of the verb. there is a time sense imposed by its use, and thus it is acting as an auxiliary (or helping) verb in defining tense.