The difference between Perfective aspect and Semelfactive aspect

When used as nouns, perfective aspect means the perfective aspect is a feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. for example, "she sat down" as opposed to "she was sitting down". since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. this term is often used interchangeably with aorist aspect. this is not to be confused with the perfect tense, whereas semelfactive aspect means a subclass of perfective verbs that denotes a momentary or action (e.g., to sneeze, to blink).

check bellow for the other definitions of Perfective aspect and Semelfactive aspect

  1. Perfective aspect as a noun (grammar):

    The perfective aspect is a feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. For example, "she sat down" as opposed to "she was sitting down". Since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. This term is often used interchangeably with aorist aspect. This is not to be confused with the perfect tense.

  1. Semelfactive aspect as a noun (grammar):

    A subclass of perfective verbs that denotes a momentary or action (e.g., to sneeze, to blink).

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