isn't的复数形式是怎样的?

isn't的复数形式是怎样的? isn't的复数形式 no it isn't 的复数形式 isn't的复数形式是什么? It isn't her knife.的复数形式. There isn't any gas station here.改为复数形式的肯定句. mango的复数形式是怎样的? ）这些英文句子的复数形式 1.This isn't her handbag.2.Is this your coat? 英语可数名词的复数形式构成是怎样的? tin-opener的复数形式是怎样的? That isn't my CD 改成复数形式 This isn't my dictionary变成复数形式怎么改?