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开始学习
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+3 f. -didn't+ 1f? Did+1f
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main events, chain of events
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+was/were+ ing-wasnt/werent+ing? was/were+ ing
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background events, two actions at the same time, yesterday at the same time
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how much/many, past experiments
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past perfect continous(budowa) 开始学习
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+had+been+ing-hadnt+been+ing? Had+been+ing
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how long? reasons for past states
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regular events, habits, long term actions
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present continuous(budowa) 开始学习
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present continuous(present) 开始学习
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at the moment of speaking, short term actions, anoying habits with always
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present perfect simple(budowa) 开始学习
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how much/many? focus on a result
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present perfect continuous(budowa) 开始学习
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present perfect continuous 开始学习
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how long? focus on action
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schedules, timetables, agendas
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present continuous(future) 开始学习
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prediction based on what we see
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predicitions based on our knowlage
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after, before, as soon as, until
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polite requests, future trends
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开始学习
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future perfect continuous(budowa) 开始学习
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future perfect continuous 开始学习
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