that is his room 变复数

that is his room 变复数 that is his pen变复数句 is this that 变复数怎么变 is that his a room?怎么改/ that is a jacket 变复数形式 That is my grandmother.怎么变复数 That is her dish变复数 whose is that book（变复数） Is that coat blue?变复数 Is there a baby in the room（变复数词 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 that is his sister改为复数形式 That box is his复数句式