农场的种类: dairy farm, poultry farm, sheep farm, wheat farm,orchard. vegetable farm 农场的动物: cow,chicken,sheep,pig,horse 农场的作物: wheat,apple, lettuce, radish,carrot, tomato,cucumber, squash,pumpkin 形容词性物主代词的用法，例如: its,their 介词的用法，例如: in,on,at 连词的用法，例如: and,so 情态动词的用法，例如: can,may 并列句，例如: It's noon and the sun is high now. 定语从句，例如: A farm is a place where people produce things There be 句型，例如: There are many kinds of farms.