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Being a verb, an infinitive may take objects and other complements and modifiers to form a verb phrase (called an infinitive phrase). Like other non-finite verb forms (like participles , converbs , gerunds and gerundives ), infinitives do not generally have an expressed subject ; thus an infinitive verb phrase also constitutes a complete non ...
The base form or plain form (go, write, climb), which has several uses—as an infinitive, imperative, present subjunctive, and present indicative except in the third-person singular; The -s form (goes, writes, climbs), used as the present indicative in the third-person singular; The past tense or preterite (went, wrote, climbed)
The irregular form tends to indicate duration, whereas the regular form often describes a short-term action (The fire burned for weeks. vs. He burnt his finger.), and in American English, the regular form is associated with the literal sense of a verb, while the irregular form with a figurative one.
For example, from the base form exist, all the inflected forms of the verb (exist, exists, existed, existing) can be predictably derived. The base form is also called the bare infinitive; that is, the infinitive without the to. Most irregular verbs have three principal parts, since the simple past and past participle are unpredictable.
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.
The basic form of the verb (be, write, play) is used as the infinitive, although there is also a "to-infinitive" (to be, to write, to play) used in many syntactical constructions. There are also infinitives corresponding to other aspects: (to) have written , (to) be writing , (to) have been writing .
In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come ...
In English, a non-finite verb form may constitute: an infinitive verb, including the auxiliary verb have — within a verb phrase that is predicated by a modal verb (e.g., "I could have cried"). within a to-infinitive phrase (e.g., "They seem to have moved"). a participle. a gerund. Each of the non-finite forms appears in a variety of environments.