高中英语-Module-3-Music-Grammar-and-usage省公开课一等奖新名师优质课

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Grammar
Grammar 1
“When” is used when the  sentences refer to a single event in the past.“When” and “while” are used when the sentences refer to a period of time in the past.“As” is used when the sentences refer to a progressive change.

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关键词：Grammar module Music usage modul