Is this pencil box?(改为陈述句)

is this her pencil box?改为陈述句 Is this pencil box?(改为陈述句) 改为复句this is my pencil box Is this your pencil?改为陈述句+复数 this is my pencil box.改为否定句 This is his pencil-box.改为复数句子怎么改? This is my pencil-box 改为同义句 This is a pencil box 改为一般疑问句 This is her pencil box.(改为否定句) 1.Is this pencil-box mine?(改为肯定句) This is a pencil box.对a pencil box 提问 This is a pencil box.(对” a pencil box”提问 )