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i usually play football改为否定句 是in the playground 还是on the playground in the playground还是on the playground in the playground on the playground 区别 in the playground和on the ground的区别 on the playground与 in the playground 区别 in the playground和on the playground的区别 you can play football well反思 

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they played football yesterday改为否定句 they play football after school改为否定句 theyplayfootballeveryday改为否定句 they play basketball改为否定句 they play football everyday变否定句 they played soccer last weekend改为否定句 they are playing football now改为否定句 they can play volleyball well改为否定句 theyareplayingfootball.改否定句 they play sports every morning改为否定句 

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