is this it?怎么改成复数 ,就是“是这个吗”改成 是这些吗.

is this it?怎么改成复数 ,就是“是这个吗”改成 是这些吗. This is a sheep怎么改成复数句?急 This is my cup 改成复数句子怎么改啊 is it yellow 改成复数形式怎么改 那：it is a pen怎么改成复数形式 Is this yuor brother改成复数形式 this is an apple.改成复数形式 Whose toy is this?改成复数句 This is my dress.改成复数句. Whose knife is this?(改成复数) this,that,is改成复数形式 this is my desk改成复数句 This is my backpack.改成复数形式 This is his photo 改成复数 what is this in English?It's an egg.改成复数句 what colour is it改成复数句 what's this?It's a box.怎么改成复数形式?下面几题也说下就是 It is her book和He is my uncle 怎么改成复数形式?