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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, while (The girl skied while the boy sledded; The boy will ski after the girl skis)
A total of 248 exercises.