因为it的复数是they ,IS 的复数是are ,book 的复数是books ,而复数名词前不能用A/AN,故要去掉AN,ENGLISH 是定语修饰名词BOOK ,没有复数,故这句话的复数就是They are English books那she that ls 的复数呢she - they that - thoseis - are我们明天就开调研考试了英语不怎么会啊！that is a pencil-box的复数形式呢Those are pencil-boxes .（）are my apples.()are your oranges 空怎么填（These）are my apples.(Those )are your oranges