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Plain style: Daily conversations Unit1-20 Audio
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Nai-Form: “have the experience of V” and “V, V and so on” Unit1-19 Audio
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Dictionary -Form: “be able to” and “to do” Unit1-18 Audio
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Nai-Form: “Please do not” and “must” Unit1-17 Audio
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Te-Form: “May I do …?”, “You must not do…” and more! Unit1-15 Audio