The imperfective aspect implies that the verb in question refers to an action or event that does not have a fixed temporal boundary, as opposed to the perfective aspect, which describes an action or event of fixed temporal dimension.
In modern Indo-European languages, the concepts of aspect and tense are usually conflated.
Along with the aorist aspect and the perfective aspect, the imperfectiveaspect is one of three aspects used in Indo-European languages.
Aspect is a somewhat difficult concept to grasp for the speakers of most modern Indo-European languages, because they tend to conflate the concept of aspect with the concept of tense.
The imperfectiveaspect is the aspectual component of tenses in various languages, such as Greek, Latin and the Romance languages, known as the imperfecttense.
Imperfectivity is the default case: the predicate is underspecified as referring to events that hold or culminate.
The underlying insight is that the imperfective marking of the predicate encodes functional abstraction on the time argument of the verbal predicate: the VP has to be read as a predicate of times.
imperfective morphology) is virtually orthogonal to the domain of the traditional aktionsart opposition (telic/atelic) and that grammatical aspect consists in a constellation of interpretive features encoding well-defined instructions at the interpretive interface.