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：we used to play games on the playground .（改成否定句） we didn't use to play games on the playground
2：the little boy is interested in reading comics.（改为否定句）
the little boy isn't interested inreading comics.
3：my sister often lietens to music in her room.（改为过去常常…）
是listen my sister often listened to music in her room