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Resultative perfect (referring to a state in the present which is the result or endpoint of an event in the past): "I have lost my pen-knife" (message: I still don't have it) Continuative perfect (past situations continuing into present): "I have always guided him" Anterior perfect (completed past situations, but with relevance to the present):
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 ...
(gerund phrase as the complement of a preposition) Using gerunds of the appropriate auxiliary verbs, one can form gerund clauses that express perfect aspect and passive voice: Being deceived can make someone feel angry. (passive) Having read the book once before makes me more prepared. (perfect) He is ashamed of having been gambling all night.
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.
Past perfect progressive (progressive, perfect): "I had been eating" Aspects can also be marked on non-finite forms of the verb: "(to) be eating" (infinitive with progressive aspect), "(to) have eaten" (infinitive with perfect aspect), "having eaten" (present participle or gerund with perfect aspect), etc.
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).
A gerund is a verb form that appears in positions that are usually reserved for nouns. In English, a gerund has the same form as a progressive active participle and so ends in -ing. Gerunds typically appear as subject or object noun phrases or even as the object of a preposition:
For the regular verbs, the gerund is formed from the infinitive of the verb by taking the stem and attaching the appropriate gerund suffix: -are verbs take -ando and the -ere and -ire verbs both take -endo. The table shows the conjugations of stare in the present tense with a gerund to exemplify the present continuous: