this is my pencil box.改为否定句

this is my pencil box.改为否定句 This is her pencil box.(改为否定句) This is my pencil-box 改为同义句 改为复句this is my pencil box This is my pencil.(改为否定句,疑问句和回答) This is his pencil case改为一般否定句 This is my eraser 改为否定句 改为一般疑问句This is a nice schoolbag.改为否定句That's your pencil box. This is his pencil.(改为否定句) Your ruler is in the pencil box.(改为否定句) it is her pencil box.改为否定句 1.Is this pencil-box mine?(改为肯定句) is this her pencil box?改为陈述句