A duck is abird that can swim as well as fly.为什么“fly”不是动名词形式？

there is a duck in frnot of two ducks的意思 the teapot is just like a chinese duck out of(whose)open mouth the tea is supposed to come. There is abird on the tree. in the tree or on the tree Mr.Duck is looking at his shopping l_____ The waiter brings in a roast duck to their table. FORTUNE DUCK "You lucky duck "和"You're a lucky dog"的区别？ a deal is a deal I'd like a cup of tea ---sugar and milk .By the way --you ever ---Roast Beijing DUCK? What is a process?