Is this a plane?yes,it is 改复数句

It is a calf(改复数句) 英语 改复数句This is a pen.Is this your backpack?It's a black bag is this a boy or a girl改复数句 复数形式转换Is she his friend.Yes,it is.This is a ( ) ( ) Susan`s 1 it is a model plane改为复数句。 2 there is some money 英语!单数句改复数!1.He is a boy2.This is his pen3.It's an English bo Is this your pencil?Yes ,it is.变复数 This dress is mine改复数句 this is my knife改复数句 英语作业求答1：This is an erange （改复数) － － 2：Is that a cap Yes it i 英语改复数形式That is a dictionary This is an exercisebook It is a Is this your model plane?(改同义句）