that is his pen变复数句

that is his pen变复数句 is that his pen?改为复数 this.is pen变复数句 that is his room 变复数 Is this a pen?（变复数句） This is a pen变为复数句,怎么变 This is pen变复数 that is his pen变一般疑问句并否定回答 It’s his pen.怎么变复数 that is his brother 改为复数句 Is that his sister?变为复数句 that is his pencil改为复数句 That is his friend.改为复数句 That is his pen.(改为否定句） 连词成句：is that green pen his (.) 英语 单数变复数 That is his pen.（ ） are （ ） pens.第二个空填什么?以及,填那个单词的原因. 英语改句子变否定句一般疑问句肯定回答否定回答复数句：this is her futher.this is my good friend.he is abrave boy?it is a yellow quilt?that is your pencil case.this is his book.iam fine.her pen is yellowandwhite.my idcard is bi This is his pen.复数形式