This is my ruler.错在哪 This is my ruler.错在哪

This is my ruler.错在哪 This is my ruler.错在哪 This is my ruler,That's you ruler 这句话有错么?错在哪里? This is my yellow ruler This is my ruler.改错 This is my ruler.(划线部分提问)my ruler画线 This is my ruler中的my ruler怎么提问? This is not () ruler .my ruler is red . This is my ruler.His ruler is not an old.--------- --------- this is my a ruler不能去掉,哪里错；额 this is my ruler改成否定句 This is my ruler (改为否定句) This is my ruler 的否定句