those怎么变单数!

those怎么变单数! those are old daesks变单数形式 those flowers are lovely.变单数 怎么单数变复数? those are old books.(变单数）_______ ____________old___________. 怎么变第三人称单数形式 tidy第三人称单数怎么变 Are you tourists?变单数怎么变. Those are kittens.(对划线部分提问) Are those puppies?（变单数句型) these are apples怎么变单数 Are they your friends?怎么变单数 I have a tomato怎么变单数 live 在第三人称单数后怎么变 teeth these those their的单数形式怎么写?急 怎么把Are those your keys改为单数形式? those,are.his.boxes改成单数,怎么改 Those are our teachers怎么改为单数形式急! Those are our tickets.的单数形式怎么写?