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In this unit, I have learnt much about past tense. This tense has some similarities with present tense, but it is related with past time periods. This unit focuses on four patterns in the past tense:past simple, past continuous, past perfect and past perfect continuous. In each category, it covers form, usage, common mistakes/errors, and sample activate teaching ideas.Students should pay attention to the verb form change for regular and irregular verbs.↵ This unit is relatively simple to study on the basis of previous knowledge on present tense.