2016-2017学年 人教版 必修三 Unit 1 Festivals around the world Grammar课件 (24张)
2016-2017学年 人教版 必修三  Unit 1 Festivals around the world Grammar课件 (24张)第3页

can and could

So he can carry heavy books. ability He couldn't open the door by himself. ability Could you open the door, please? request


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