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This unit gave an overview of the four past tenses and their usages. The past forms mirror their present counterparts, and also the future forms. The present and past continuous both use the "-ing" form of the verb, the present and past perfect employ the auxiliary "have" and the past participle, and the present and past perfect continuous involve both auxiliaries "have", "be", and the "-ing" form. The past simple is used to describe past actions that occurred at a definite time. The past continuous is used for actions that were ongoing in the past. The past perfect is used for actions that were completed before another past action, or put another way, the past in the perspective of a past viewpoint. The past perfect continuous describes actions that were ongoing before another past action. For example, "When I arrived, he had been playing the tuba for hours." It does not specify whether the action will continue into the future or not.
