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In linguistics, the lexical aspect or Aktionsart (German pronunciation: [ʔakˈtsi̯oːnsˌʔaːɐ̯t], plural Aktionsarten [ʔakˈtsi̯oːnsˌʔaːɐ̯tn̩]) of a verb is part of the way in which that verb is structured in relation to time. For example, the English verbs arrive and run differ in their lexical aspect since the former describes an event which has a natural endpoint while the latter does not. Lexical aspect differs from grammatical aspect in that it is an inherent semantic property of a predicate, while grammatical aspect is a syntactic or morphological property. Although lexical aspect need not be marked morphologically, it has downstream grammatical effects, for instance that arrive can be modified by "in an hour" while believe cannot.

Theories of aspectual class

Although all theories of lexical aspect recognize that verbs divide into different classes, the details of the classification differ. An early attempt by Vendler recognized four classes, which has been modified several times.

Vendler's classification

Zeno Vendler classified verbs into four categories on whether they express "activity", "accomplishment", "achievement" or "state". Activities and accomplishments are distinguished from achievements and states in that the first two allow the use of continuous and progressive aspects. Activities and accomplishments are distinguished from each other by boundedness. Activities do not have a terminal point (a point before which the activity has taken place and after which it cannot continue: "John drew a circle"), but accomplishments have one. Of achievements and states, achievements are instantaneous, but states are durative. Achievements and accomplishments are distinguished from one another in that achievements take place immediately (such as in "recognise" or "find"), but accomplishments approach an endpoint incrementally (as in "paint a picture" or "build a house").^[1]^[2]

Comrie's classification

In his discussion of lexical aspect, Bernard Comrie included the category semelfactive or punctual events such as "sneeze". His divisions of the categories were as follows: states, activities, and accomplishments are durative, but semelfactives and achievements are punctual. Of the durative verbs, states are unique as they involve no change, and activities are atelic (that is, have no "terminal point") whereas accomplishments are telic. Of the punctual verbs, semelfactives are atelic, and achievements are telic. The following table shows examples of lexical aspect in English that involve change (an example of a state is 'know').^[1]^[3]

	Punctual	Durative
Telic	Achievement (to release)	Accomplishment (to drown)
Atelic	Semelfactive (to knock)	Activity (to walk)
Static		State (to know)

Moens and Steedman's classification

Another classification is proposed by Moens and Steedman, based on the idea of the event nucleus.^[4]

	Event nucleus
	Preparatory phase	Culminating event	Consequent phase
Semelfactive
State
Activity
Achievement
Accomplishment

Syntactic analyses of event structure

Aspectual classes can be analyzed as differing in their event structure, and this has led to the development of syntactic analyses of event structure, with each aspectual class treated as having a distinct syntactic structure.

References

^ ^a ^b Rothstein, Susan (2016). "Aspect". In Aloni, Maria; Dekker, Paul (eds.). Cambridge Handbook of Formal Semantics. Cambridge University Press. ISBN 978-1-107-02839-5.
^ Vendler, Zeno (1957). "Verbs and Times" (PDF). The Philosophical Review. 66 (2): 143–160. doi:10.2307/2182371. JSTOR 2182371.
^ Comrie, Bernard (1976). Aspect: An Introduction to the Study of Verbal Aspect and Related Problems. Cambridge Textbooks in Linguistics. Cambridge University Press. ISBN 9784838401000.
^ Moens, Marc; Steedman, Mark (1988). "Temporal ontology and temporal reference" (PDF). Computational Linguistics. 14 (2). Association for Computational Linguistics: 15–28. ISSN 0362-613X.