They are playing football on the grass.这句话哪里有错

They are playing football on the grass.这句话哪里有错 They are playing the football还是They are playing football? They are playing football on the playground 改否定句 英语改错题they are playing the chess on the grass They are playing football the day before yesterday.这句话错了吗?怎么 1 they are students.they are playing football on the playgro ;some are playing football on the playground They are boy这句话中哪里有错? they are playing football on the field.改一般疑问句做否定回答 They are (playing football) {on the playground.}分别对两个括号提问 They are (playing football) on the playground(对打括号部分提问) he is playing football now这句话有错吗