(4) Word class (词类) A more practical way is to classify words either by analyzing their grammatical properties or by grouping them into classes according to their formal similarities. But there are only two classes, something like today’s subject and predicate. Later, nine word classes were established: they were noun, pronoun, adjective, verb, adverb, preposition, conjunction, interjection and article. Today, a few more word classes have been introduced into grammar. They are particles, auxiliaries, determiners. 关于词汇分类的一种更为实际的方法就是根据他们的形式的相似之处分析词汇分类的语法属性或分组成类。但只有两类，类似今天的主语和谓语。之后，词汇被分成九种词类：他们是名词、代名词、形容词、动词、副词，介词，连词、感叹词和冠词。今天，几种词类被引入了语法。他们是小品词，辅助词，限定词。