In linguistics, a non-finite verb (or a verbal) is a verb form that is not limited by a subject; and more generally, it is not fully inflected by categories that are marked inflectionally in language, such as tense, aspect, mood, number, gender, and person. As a result, a non-finite verb cannot generally serve as the main verb in an independent clause; rather, it heads a non-finite clause.
By some accounts, a non-finite verb acts simultaneously as a verb and as another part of speech; it can take adverbs and certain kinds of verb arguments, producing a verbal phrase (i.e., non-finite clause), and this phrase then plays a different role — usually noun, adjective, or adverb — in a greater clause. This is the reason for the term verbal; non-finite verbs have traditionally been classified as verbal nouns, verbal adjectives, or verbal adverbs.
English has three kinds of verbals: participles, which function as adjectives; gerunds, which function as nouns; and infinitives, which have noun-like, adjective-like, and adverb-like functions. Each of these kinds of verbals is also used in various common constructs; for example, the past participle is used in forming the perfect aspect (to have done).
Other kinds of verbals, such as supines and gerundives, exist in other languages.
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A participle is a verbal adjective that describes a noun as being a participant in the action of the verb. English has two kinds of participles: a present participle, also called an imperfect participle, which ends in -ing and which ordinarily describes the agent of an action, and a past participle, also called a perfect participle, which typically ends in -ed (but can also end in -en, -t, or none of these), and which ordinarily describes the patient of an action.
The following sentences contain participles:
In English, the present participle is used in forming the continuous aspect (to be doing); the past participle is used in forming the passive voice (to be done) and the perfect aspect (to have done).
A participial phrase is a phrase consisting of a participle and any adverbials and/or arguments; the participle is the head of such a phrase:
A gerund is a verbal noun that refers to the action of the verb. In English, a gerund has the same form as a present participle (see above), ending in -ing:
A gerund phrase is a phrase consisting of a gerund and any adverbials and/or arguments; the gerund is the head of such a phrase:
In English, the infinitive verb form is often introduced by the particle to, as in to eat or to run. The resulting phrase can then function as a subject or object, or as a modifier.
An infinitive phrase consists of an infinitive and any related words.
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