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Unit Six covers the structure of the past tenses, which include the past simple, past perfect, past continuous, and past perfect continuous. The past tenses include similarities to the present tenses. Both the past and present continuous forms have the verb 'to be' in addition to the -ing form of the following verb.
The perfect forms utilizes the verb 'to have' as the auxiliary, which is then added to the past participle of the verb. It is the tense of the auxiliary verb that determines whether the sentence is in the past or the present. The perfect continuous forms function a similar way, and feature 'to have' plus 'been' followed by the -ing form of the verb.
