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The Verbs VI: Perfectives and Abstract Time Module consists of 4 lessons plus a placement test and post test.
The lessons cover:

1. Perfective verbs: past, present, and future ("has eaten," "had eaten," "will have eaten").
2. Abstract time expressions: since, until, for, and in ("for two hours," "in two hours").
3. Comparative time expressions: before, after, when, during ("The girl skied while the boy sledded;" "The boy will ski after the girl skis").

A total of 248 exercises.