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Infinitive (abbreviated INF) is a linguistics term for certain verb forms existing in many languages, most often used as non-finite verbs that do not show a tense.As with many linguistic concepts, there is not a single definition applicable to all languages.
In the usual description of English, the basic form, with or without the particle to, is the infinitive. In many languages, verbs are inflected (modified in form) to encode tense, aspect, mood, and voice. A verb may also agree with the person, gender or number of some of its arguments, such as its subject, or object.
Perfect infinitives (prior infinitives) occur at a time before the main verb. Future infinitives (subsequent infinitives) occur at a time after the main verb. For example, the contemporaneous infinitive in this sentence, Dīxērunt eum iuvāre eam. would still be translated "They said he was helping her," even though iuvāre is a present ...
The Ancient Greek infinitive is a non-finite verb form, sometimes called a verb mood, with no endings for person or number, but it is (unlike in Modern English) inflected for tense and voice (for a general introduction in the grammatical formation and the morphology of the Ancient Greek infinitive see here and for further information see these tables).
The present active infinitive is the second principal part (in regular verbs). It plays an important role in the syntactic construction of Accusative and infinitive, for instance. laudāre means, "to praise." The present passive infinitive is formed by adding a –rī to the present stem. This is only so for the first, second and fourth ...
The verb catena (in purple) contains four verbs (three of which are non-finite) and the particle to, which introduces the infinitive have. Again, the one finite verb, did, is the root of the entire verb catena and the subject, they, is a dependent of the finite verb. The third sentence has the following dependency structure:
Certain verb–modifier combinations, particularly when they have independent meaning (such as take on and get up), are known as "phrasal verbs". For details of possible patterns, see English clause syntax. See the Non-finite clauses section of that article for verb phrases headed by non-finite verb forms, such as infinitives and participles.
The main uses of the various nonfinite verb forms (infinitives, participles and gerunds) are described in the following sections. For how these forms are made, see § Inflected forms of verbs above. For more information on distinguishing between the various uses that use the form in -ing, see -ing: Uses.