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The perfect tense or aspect (abbreviated PERF or PRF) is a verb form that indicates that an action or circumstance occurred earlier than the time under consideration, often focusing attention on the resulting state rather than on the occurrence itself.
The concept of grammatical aspect (or verbal aspect) should not be confused with perfect and imperfect verb forms; the meanings of the latter terms are somewhat different, and in some languages, the common names used for verb forms may not follow the actual aspects precisely.
A perfect tense does not necessarily have to be perfective in aspect. For example, "I have been waiting here for an hour" and "I have been going to that doctor all my life" are perfect but also imperfective in aspect. There are some languages, however, such as Modern Greek, in which the perfect tense is always perfective. [10]
The perfect aspect is expressed with a form of the auxiliary have together with the past participle of the verb. Thus the present perfect is have written or has written, and the past perfect (pluperfect) is had written. The perfect can combine with the progressive aspect (see above) to produce the present perfect progressive (continuous) have ...
In English, completed actions in many contexts are referred to using the simple past verb form rather than the present perfect. English also has a present perfect continuous (or present perfect progressive) form, which combines present tense with both perfect aspect and continuous (progressive) aspect: "I have been eating". The action is not ...
There is a perfect form in both tenses, which is expressed by an inflected form of the imperfective auxiliary verb έχω "have" and an invariant verb form derived from the perfective stem of the main verb. The perfect form is much rarer than in English. The non-past perfect form is a true perfect aspect as in English.
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 ...
Proto-Indo-European verbs reflect a complex system of morphology, more complicated than the substantive, with verbs categorized according to their aspect [a], using multiple grammatical moods and voices, and being conjugated according to person, number and tense.