what;s this的复数句

what;s this的复数句 What's this?It's a pen.(改为复数句) what's this?It's window.改复数句 what's this?it's a cat变为复数句 英语What's this?的复数形式是? 把下列的英文句子按要求改 this is a cake.（改为复数句） what's that?（改为复数句） What's this?怎么改为复数形式 What's this in English?复数 What’s this?复数形式简单吧 What is this?变为复数句___________________________. what is this in English?It's an egg.改成复数句 英语句的复数形式What is this?It is a desk.改为复数形式