She has a knife.变复数句

She has a knife.变复数句 He has a knife.改复数句 This is a knife.怎样变复数. She has a computer.(改为复数句) She has a puppet改为复数句 she has a nice dress.怎么变复数形式 this is knife in the box（变复数句 She is from America and she has short hair.变复数句 I have a knife变句1变为第三人称单数形式 2变为复数形式 3变为一般疑问句 4对a knife进行提问~ “knife”怎样变复数形式? knife的复数怎么变 She has short hair.变复数 she has a brother怎么改为复数句? She has a good friend.(改成复数句） She has got a nice picture(改成复数句） There is a knife on the desk.改复数句 She is my friend.变复数句 she is an airhostess.变复数句