Imperfective aspect

The imperfective (abbreviatedNPFV, ipfv, or more ambiguously impv) is a grammatical aspect used for ongoing, habitual, repeated, or similar semantic roles, whether they are in the past, present, or future. Many languages have a general imperfective; others have distinct aspects for specific roles such as progressive, habitual, and iterative. The imperfective contrasts with the perfective, which is used for actions as a complete whole.