This document defines three non-finite verb forms: gerunds, which are verbs ending in "-ing" that function as nouns; infinitives, verbs preceded by "to" that function as nouns; and participles, past tense verb forms that function as nouns or adjectives.

1. PAST TENSE

8. Gerund- a verb form ending in-ing and
functioning in a sentence as a noun.
Infinitive- a verb proceeded by “to”
functioning as a noun in a sentence, and
usually introducing a phrase.
Participle- a past tense form of a verb
functioning in a sentence as either a noun or
adjective.