is that a watch?改为复数句急

Is that a watch 怎么改为复数句子? is that a watch?改为复数句急 Is that a watch?(怎么改为复数形式） It is a watch.(改为复数形式) this is a watch(改为复数句) That is my watch.（改为复数句） That's a nice watch.怎么改为复数句? that isn't a watch改为复数形式? Is this a watch?（改为复数句子） Is there a watch on the desk?改为复数句 It is a watch.(改为复数）清楚,明白 That is a box 改为复数句子 that is a pencil.改为复数句 Is that a book改为复数形式 That is a dictionary.改为复数句 Is that a basketball?改为复数形式 Is that this watch?改为复数形式还有：The woman is my teacher. Where is the watch?改为复数句