将this is his pencil改为一般疑问句

将this is his pencil改为一般疑问句 This is your pencil.(改为一般疑问句) this is a pencil.(改为一般疑问句) this is a This is his pencil sharpener 改为一般疑问句和否定句怎么改? his pencil box is under the sofa(改为一般疑问句) His pencil box is under the sofa.改为一般疑问句 That is his pencil sharpener.改为一般疑问句 This is my pencil case.改为一般疑问句 This is your pencil sharpener.改为一般疑问句 This is a pencil box 改为一般疑问句 把this is her pencil case 改为一般疑问句 This is my new pencil case 改为一般疑问句