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This isn't unit six which is the PAST TENSES,it is a part of speech too,past tenses is divided into four different parts;past simple tense,past continuous tense,past perfect tense and the past perfect continuous tense.All of them are used at different times depending on the time of the action.The past simple tense is used for actions completed at a definite time in the past for example we have the Regular and irregular verbs of the past tense.Past continuous tense is used for interrupted past actions and without a time expression for gradual development that took place in the past.Past perfect tense is used for the past equivalent of the present participle..when I arrived,the concert had started.Finally we have the past perfect continuous tense which has the same form as the other tenses like Affirmative,negative and the question form.
