is that his pen?改为复数

is that his pen?改为复数 that is his pen变复数句 that is his brother 改为复数句 is that his key (改为复数形式) that is his pencil改为复数句 that is his sister改为复数形式 That is his friend.改为复数句 That book is his?改为复数形式 That apple is his.(改为复数) What is that?itis a pen改为复数形式 Is this your pencil?改为陈述句+复数Is this my pen?Is that his book?Is that her eraser?还有这几个？ That is his pen.(改为否定句） 1.Is that his pen?(改为复数) 2.She is my good friend.（改为一般疑问句）3.That is Cheng Long.（改为一般疑问句） 4.lt is Dave.（改为一般疑问句） 1：is that his pen?改复数 2：she is my good friend.改为一1：is that his pen?改复数2：she is my good friend.改为一般疑问句3：that is Cheng Long改一般疑问句4：it's dave.改一般疑问句 That is his book.怎么改为复数句 Is that his ball改为复数并作肯定回答 This is a pen and that is a knife改为复数形式 This is his pen.复数形式