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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. An example of a perfect construction is I have made dinner.
A game with complete information may or may not have perfect information, and vice versa. Examples of games with imperfect but complete information are card games, where each player's cards are hidden from other players but objectives are known, as in contract bridge and poker , [ 4 ] [ 5 ] if the outcomes are assumed to be binary (players can ...
Other terms for the contrast lexical vs. grammatical include: situation vs. viewpoint and inner vs. outer. [10] [11] Lexical aspect, also known as Aktionsart, is an inherent property of a verb or verb-complement phrase, and is not marked formally. The distinctions made as part of lexical aspect are different from those of grammatical aspect.
The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect is used. For example: I have written a letter this morning. (if it is still the morning) He has produced ten plays.
In Ancient Greek, the perfect tense (Ancient Greek: χρόνος παρακείμενος, romanized: khrónos parakeímenos) [9] is a set of forms that express both present tense and perfect aspect (finite forms), or simply perfect aspect (non-finite forms). However, not all languages conflate tense, aspect and mood.
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 necessarily complete; and the same is true of certain uses of the basic present perfect when the verb expresses a state or a ...