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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 ...
In traditional grammars, gerunds are distinguished from other uses of a verb's -ing form: the present participle (which is a non-finite verb form like the gerund, but is adjectival or adverbial in function), and the pure verbal noun or deverbal noun.
This is followed by the simple past tense , and then the past participle. If there are irregular present tense forms (see below), these are given in parentheses after the infinitive. (The present participle and gerund forms of verbs, ending in -ing, are always regular. In English, these are used as verbs, adjectives, and nouns.)
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 ...
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 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.
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.
A non-finite clause is similar, except that the verb must be in a non-finite form (such as an infinitive, participle, gerund or gerundive), and it is consequently much more likely that there will be no subject expressed, i.e. that the clause will consist of a (non-finite) verb phrase on its own. Some examples are given below. Finite clauses