That box is his复数句式

That box is his复数句式 this dictionary is in that box复数 That is a box 改为复数句子 is that a box改成复数 that is his box.句子换成his box is that.可不可以,为什么? This is his pencil-box.改为复数句子怎么改? The lunch box is his.(改成复数句） 将下列句子变为复数He is your drother.This is his box.She is a teacher.That is a bag. 将下列句子变为复数急用!1He is your drother.This is his box.She is a teacher.That is a bag. This book is in that box.（改为复数形式） that is her pencil—box(改复数句) That is a box 改为单数或则复数 that is his brother 改为复数句 That is his brother的复数形式 Is that his sister?变为复数句 is that his key (改为复数形式) Is that his uncle的复数形式 that is his pencil改为复数句