Is 【this】 your pencil-box.问为什么用this.

Is 【this】 your pencil-box.问为什么用this. is this your pencil-box?的答语 Is This your pencil box?做肯定回答 Is this your pencil? this is your pencil This is a pencil box.对a pencil box 提问 This is a pencil box.(对” a pencil box”提问 ) Is this your pencil box ____ the lost and found box ? （ ）pencil-box is this?填什么 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