Aspect, on the other hand, refers to how a situation is being viewed with respect to ‘its own internal temporal constituency (or make-up)’ (Comrie, 1976: 3). A situation may be viewed by the speaker with an emphasis on a particular phase along the course of its progress, such as on its beginning, its continuation (process), or its completion. Each of the stages is referred to as an aspect. Therefore, aspect is a matter of the speaker's viewpoint or perspective of a situation. The speaker may choose to present an event as complete (perfective aspect), as going on (progressive aspect), as beginning (inceptive aspect) or as continuing (continuative aspect) and so on (Brinton, 1988: 3). In short, reference is made to the temporal quality of a situation as it progresses through time.
 Loar, J. K. (2011). Chinese syntactic grammar: functional and conceptual principles. New York: Peter Lang.