Is this a watch?（复数）

Is this a watch?（复数） Is this a watch?（改为复数句子） this is a watch(改为复数句) 把下列句子变成复数形式.This is a watch. This is her watch.[变复数】 Is that this watch?改为复数形式 Is this a c（）?No,it is a watch. Is that a watch?(怎么改为复数形式） This is a cinema.（改为复数） This is a marker.（变复数） It is a watch.变成复数句 It is a watch.(改为复数形式)