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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.
There is a perfect infinitive (to) have written and a perfect progressive infinitive (to) have been writing, and corresponding present participle/gerund forms having written and having been writing. A perfect subjunctive (have written) is also sometimes used. Future and conditional perfect forms are given below.
The preterite and past participle forms of irregular verbs follow certain patterns. These include ending in -t (e.g. build, bend, send), stem changes (whether it is a vowel, such as in sit, win or hold, or a consonant, such as in teach and seek, that changes), or adding the [n] suffix to the past participle form (e.g. drive, show, rise ...
Most verbs have three or four inflected forms in addition to the base form: a third-person singular present tense form in -(e)s (writes, botches), a present participle and gerund form in -ing (writing), a past tense (wrote), and – though often identical to the past tense form – a past participle (written).
The term gerund is applied to clauses similar to [4a] and [4b]. In [6a] and [6b] coming is related to the participle use as an adverbial. in [5a] and [5b] the verbs kept and coming refer to the same event. Coming is related to the progressive aspect use in She is coming.
The past participle is been, which is pronounced with an /ɪ/ sound in US English, and the present participle and gerund forms are regular: being. For more details see Indo-European copula . As mentioned above, apart from its other irregularities, the verb do , which is pronounced with an /u/ sound, has the third person present indicative does ...
Infinitive phrases often have an implied grammatical subject making them effectively clauses rather than phrases. Such infinitive clauses or infinitival clauses, are one of several kinds of non-finite clause. They can play various grammatical roles like a constituent of a larger clause or sentence; for example it may form a noun phrase or ...
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.