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The word perfect in this sense means "completed" (from Latin perfectum, which is the perfect passive participle of the verb perficere "to complete"). In traditional Latin and Ancient Greek grammar, the perfect tense is a particular, conjugated-verb form.
Complete information is importantly different from perfect information. In a game of complete information, the structure of the game and the payoff functions of the players are commonly known but players may not see all of the moves made by other players (for instance, the initial placement of ships in Battleship); there may also be a chance ...
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 ...
[4] [5] On the other hand, some languages make finer tense distinctions, such as remote vs recent past, or near vs remote future. Tenses generally express time relative to the moment of speaking. In some contexts, however, their meaning may be relativized to a point in the past or future which is established in the discourse (the moment being ...
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.
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.
The past perfect, sometimes called the pluperfect, combines past tense with perfect aspect; it is formed by combining had (the past tense of the auxiliary have) with the past participle of the main verb. It is used when referring to an event that took place prior to the time frame being considered. [10]
subject I + habré future of haber will have + hablado past participle spoken yo {} habré {} hablado subject + { future of haber } + {past participle} I {} {will have} {} spoken The future of haber is formed by the future stem habr + the endings -é, -ás, -á, -emos, -éis, -án. The past participle of a verb is formed by adding the endings -ado and -ido to ar and er / ir verbs, respectively ...