Nonfinite verb
Nonfinite verbs are verb forms that do not show tense, person, or number. They include: Infinitives (e.g., to go, to see), which are the base forms of verbs, and may also function as nouns or adverbs; Gerunds (e.g., going, seeing), which act as nouns, but are derived from verbs; Participles (e.g., gone, seen), which can function as adjectives, in forming verbal aspects (such as has gone) and the passive voice, and as components of participial phrases.