Is that a pencil?和That is a pencil?有区别吗?

Is that a pencil?和That is a pencil?有区别吗? Is that a pencil s___? that is a pencil.改为复数句 This pencil is 18cm.That pencil is 20cmThis pencil is a ___ ____ than that one is,too,that,pencil,my,and) (is,case,yellow,this,a,pencil(is,too,that,pencil,my,and) (is,case,yellow,this,a,pencil)连词成句 That is a pencil case对a pencil case画线提问 改错改错Is that a pencil case?Yes,it's. is,pencil,that,a.(连词成句） 对括号部分提问:That is (a pencil sharp enet) That is a pencil case.(改为否定句) That is a pencil sharpener怎么变为一般疑问句? That is a pencil box 这句话哪儿错了 That is a pencil box（改为否定） that is a red pencil变为否定句 That is my a pencil-box.改病句 Is that your pencil是什么意思 That is your pencil,__ Is that a pencil?的答语是Yes,it is.还是 Yes,that is.