this is a pencil 改为特殊疑问句是不是what is this?

this is a pencil 改为一般疑问句 this is a pencil改为复数句 This is a pencil sharpener.(改为一般疑问句) This is a pencil box 改为一般疑问句 This is a pencil case.(改为复数句子） this is a short pencil （改为同义句） This is a short pencil.改为同义句 This is his red pencil改为同义句 （ ）（ ）a red pencil This is his red pencil改为同义句 （ ）（ ）a red pencil. this is a pencil.(改为一般疑问句) this is athis is a pencil.(改为一般疑问句)this is a dictionary.(划线部分提问,dictionary划线) This is your pencil.(改为一般疑问句) 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 This is his pencil.(改为否定句) this is a pencil 改为特殊疑问句是不是what is this? This is a pencil box.对a pencil box 提问 This is a pencil box.(对” a pencil box”提问 )