Grammar is a very old field of study. Did you know that the sentence was first divided into subject and verb by Plato, the famed philosopher from ancient Greece? That was about 2,400 years ago! Ever since then, students all over the world have found it worthwhile to study the structure of words and sentences. Why? Because skill in speaking and writing is the hallmark of all educated people.语法是一个非常古老的研究领域。你知道句子最早被古希腊著名哲学家柏拉图分为主语和动词吗？那是大约2400年前的事了! 从那时起，全世界的学生都觉得研究单词和句子的结构是值得的。为什么这么说呢？因为说话和写作的技巧是所有受过教育的人的标志。