Classification of words Variable and invariable words 可变词和不变词 Grammatical words and lexical words 语法词和词汇词 (function words and content words 功能词和实义词) Closed-class words and open- class words 封闭类词和开放类词Classification of words Variable and invariable words 可变词和不变词 Grammatical words and lexical words 语法词和词汇词 (function words and content words 功能词和实义词) Closed-class words and open￾class words 封闭类词和开放类词