1：we used to play games on the playground .（改成否定句） we __ __ __ play games on the playground
问题描述：
1：we used to play games on the playground .（改成否定句） we __ __ __ play games on the playground
2： the little boy is interested in reading comics.（改为否定句）
the little boy __ __ __ reading comics.
3：my sister often lietens to music in her room.（改为过去常常…）
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答
1,used not to 或 didn't useto
2,isn't interested
3,my sister used to lisen to music in her room