Locate the infinitive and determine how it is used.

Jane wanted to forget about the matter.

noun

adjective

adverb

Infinitive phrases starts with infinitives that is, "to" added by a simple verb and can be used as nouns, adjectives or adverbs. In the case of including a main clause in the sentence, infinitive phrase separates it with comma. In the sentence: Jane wanted to forget about the matter. The infinitive phrase is ‘to forget about the matter’ and it is used as an adverb.