把以下每句变复数 Is this your cap ,jane?No.it's not mine .Whose cap is it,then?It'sSally;s

把以下每句变复数 Is this your cap ,jane?No.it's not mine .Whose cap is it,then?It'sSally;s this.is pen变复数句 this is knife in the box（变复数句 Is this a pen?（变复数句） This is a pen变为复数句,怎么变 This is a horse.变该句为复数形式 this is a box.变复数句___________? This baby is sleeping on the train变复数句 This set of rulers is blue 变复数句 this is a marker怎么变复数句 This is pen变复数 is this that 变复数怎么变 This is a[backpack]变否定句、对画框部分提问、变复数句RT This is an eraser That is aThis is an eraserThat is a plate变复数句 把this is a sheep改为复数句 把His father is this blouse .改为复数句 this is a bus.把它改为复数句 把英语改为复数句This is a map of Japan.(改为复数句)( )( )( ) of Japan.