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For all uses of specific perfect constructions, see the sections below on the present perfect, past perfect, future perfect, and conditional perfect. By using non-finite forms of the auxiliary have , perfect aspect can also be marked on infinitives (as in should have left and expect to have finished working ), and on participles and gerunds (as ...
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 ...
In perfect progressive (or perfect continuous) constructions, the perfect auxiliary (a form of have) is followed by the past participle been (from be, the auxiliary of the progressive aspect), which in turn is followed by the present participle of the main verb. As before, the perfect auxiliary can appear in various tenses, moods and non-finite ...
The past participle is been, and the present participle and gerund is the regular being. The base form be is used regularly as an infinitive, imperative and (present) subjunctive. For archaic forms, see the next section. English has a number of modal auxiliary verbs which are defective.
The other inflected parts of the verb – the third person singular present indicative in -[e]s, and the present participle and gerund form in -ing – are formed regularly in most cases. There are a few exceptions: the verb be has irregular forms throughout the present tense; the verbs have , do , and say have irregular -[e]s forms; and ...
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 traditional terms are misleading because the participles do not necessarily correspond to tense: [16] the present participle is often associated with the progressive (continuous) aspect, while the past participle is linked with the perfect aspect or passive voice. See the examples below:
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 ]