This knife is his.怎么改复数形式的句子?

This knife is his.怎么改复数形式的句子? This knife is sharp and that knife is blunt 翻译 Whose knife is this?(改成复数) This is a knife 改为复数 Is this your knife 改为复数句子 This is a knife.怎样变复数. this is my knife改复数句 Is this her knife变复数 This knife is broken.(同义句) This is a box and that is a knife.改为复数形式〔怎么变的〕 this is knife in the box（变复数句 whose knife is this?将句子变成复数 This is an apple,that's a knife句型转换 连词组句 your,this,not,knife,is this knife is jim's.有没有错? 否定句 This knife is for the Liu Tao. This isn't her knife._________ is green. This is a__________． Those are three__________．（knife）