this is a bus.【变为复数句】

this is a bus.【变为复数句】 that is a bus.(变为复数句）that is a bus.(变为复数句） Is this a bus （改为复数句 this is a bus.把它改为复数句 This is a pen变为复数句,怎么变 This is my sister(变为复数句) Is this your book ? 变为复数句 ls this a bus复数句 This is a bus.改为复数. What is this?变为复数句___________________________.It is an arm.变为复数句___________________________.This is a foot.变为复数句___________________________.What are these?变为单数句___________________________.These are bags.变为 This is a key.(变为复数) Is it a bus?的复数句 It is a watch.变为复数句 there is a library in this building 这句变为复数 英语题目(单数句改成复数句),(复数句改为单数句)this is a bus.that is a big peachthey are girlsthey are old monkeys. Is this a car?复数Is this a car?(变为复数） Yes,it is.（变为复数） This is my good friend 变为复数句 This book is very interesting（变为复数句）