>>87983005Pretty confident it's #2.
"use" in this context is weird, but it's definitely the main verb of the sentence. "to..." is the start of an infinitive phrase.
The "Did" in "Didn't" already expresses the past tense aspect, so the main verb is present tense.
Example sentences:
>I loved to buy acrylic stands.Just the past tense verb.
>I did love to buy acrylic stands."Did" + the present tense verb.
>Didn't you love to buy acrylic stands?Rephrased as a question, still "Did" + the present tense verb.
