Editing Imperfective aspect (section)

==Slavic languages==
Verbs in [[Slavic languages]] have a perfective and/or an imperfective form. Generally, any of various [[prefix]]es can turn imperfectives into perfectives;<ref>
{{cite book
| last1 = Bybee
| first1 = Joan
| author-link1 = Joan Bybee
| last2 = Perkins
| first2 = Revere
| last3 = Pagliuca
| first3 = William
| chapter = 1: Theoretical Background
| title = The Evolution of Grammar: Tense, Aspect, and Modality in the Languages of the World
| chapter-url = https://books.google.com/books?id=aOvU6m-f1IwC
| location = Chicago
| publisher = University of Chicago Press
| date = 1994
| page = 17
| isbn = 9780226086651
| access-date = 2016-08-04
| quote = The Slavic perfective prefixes originally signaled locative notions which made the verb [[telicity|telic]] (just as ''go out'', ''go through'', and ''eat up'' are telic in English).
}}
</ref>
[[suffix]]es can turn perfectives into imperfectives.<ref>
{{cite book
| last1 = Josephson
| first1 = Folke
| chapter = Actionality and aspect in Hittite
| editor1-last = Josephson
| editor1-first = Folke
| editor2-last = Söhrman
| editor2-first = Ingmar
| title = Interdependence of Diachronic and Synchronic Analyses
| chapter-url = https://books.google.com/books?id=8ZuTTIhLadgC
| series = Studies in language companion series
| volume = 103
| location = Amsterdam
| publisher = John Benjamins Publishing
| date = 2008
| page = 143 
| isbn = 9789027205704
| access-date = 2016-08-04
| quote = The imperfective suffix in Slavic languages corresponds to the English progressive (cf. Borer 2005). [...] According to Arsenijevic the meaning of the Slavic imperfective suffix is slightly more general than that of the progressive.
}}
</ref>
The non-past imperfective form is used for the present, while its perfective counterpart is used for the future. There is also a [[periphrastic]] imperfective future construction.<ref name=Dahl>[[Östen Dahl]], 1985. ''Tense and Aspect Systems''. Blackwell.</ref>{{rp|84}}