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From unit 6, I have learned the theoretical concepts and usages of past tenses. This topic includes four different expression of past actions, such as past simple, past continuous, past perfect and past perfect continuous. The difference between past continuous and past perfect continuous is not only the form of writing them but also the specific usage of them. For past continuous, it can express an action, which began before that time and probably continued after it. While for past perfect continuous, it talks about longer actions or situations in the past that had been going on continuously up to the past moment that we are thinking about.
