Is this pencil box?(改为陈述句)

This is a pencil box.对a pencil box 提问 This is a pencil box.(对” a pencil box”提问 ) Is this pencil box?(改为陈述句) 改为复句this is my pencil box is this her pencil box?改为陈述句 （ ）pencil-box is this?填什么 is this your pencil-box?的答语 This pencil box is orange.改同义句This is ----- ----- pencil box.下面两个回答不对， Is 【this】 your pencil-box.问为什么用this. This is a pencil box 改为一般疑问句 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这个句子有什么错 This pencil box is _____ (nice) than that one. this is my pencil box.改为否定句 this pencil box is mine.针对mine划线提问. This is her pencil box.(改为否定句) Is This your pencil box?做肯定回答