The perfective aspect (abbreviated PFV), sometimes called the aoristic aspect, is a grammatical aspect used to describe a situation viewed as a simple whole, whether that situation occurs in the past, present, or future. The perfective aspect is equivalent to the aspectual component of past perfective forms variously called "aorist", "preterite", and "simple past". Although the essence of the perfective is an event seen as a whole, a unit without internal structure, most languages which have a perfective use it for various similar semantic roles, such as momentary events and the onsets or completions of events, all of which are single points in time and thus have no internal structure. Other languages instead have separate momentane, inchoative, or cessative aspects for those roles, with or without a general perfective.
The perfective aspect is distinguished from the imperfective aspect, which presents an event as having internal structure (such as ongoing or habitual actions), and from the prospective aspect, which describes impending action.
Read more about Perfective Aspect: Equivalents in English, Marking, Perfective Vs. Perfect
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