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Non-finite verb forms ending in -ing, whether termed gerund or participle may be marked like finite forms as Continuous or Non-continuous, Perfect or Non-perfect, Active or Passive. Thus, traditional grammars have represented the gerund as having four forms – two for the active voice and two for the passive: [ 24 ]
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 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.
The other non-finite verb forms in English are the gerund or present participle (the -ing form), and the past participle – these are not considered infinitives. Moreover, the unmarked form of the verb is not considered an infinitive when it forms a finite verb : like a present indicative ("I sit every day"), subjunctive ("I suggest that he ...
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 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 ...
The Arabic verb has two participles: an active participle (ʾism al-fāʿil اسم الفاعل) and a passive participle (ʾism al-mafʿūl اسم المفعول), and the form of the participle is predictable by inspection of the dictionary form of the verb. These participles are inflected for gender, number and case, but not person.
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.