把Where is his pencil.改成复数句

把Where is his pencil.改成复数句 that is his pencil改为复数句 this is his pencil case 复数句 This is my pencil.（改为复数句） It's his backpack.（改为复数句） IS this his book?改为复数句 This is my pencil.改为同义句 The lunch box is his.(改成复数句） It isn't his pencil-box?改成复数 将下列单数句改为复数句 Is this your pencil?Is that your cousin?Where is this is a pencil改为复数句 Is that her pencil?改为复数句 that is a pencil.改为复数句 It is my pencil.改成否定句