Chapter Three Lexicon Morphology 3. The classification of words(P80 3.1 According to their variability: variable and invariable words(可变化词和不变词)Ⅴ ariable words are those words which can take inflective endings; invariable words are those that cannot 3.2 According to the eir grammatical and semantic properties: grammatical and lexical words(ait 词和词汇词) 词汇词也即实词,又译作 notional/content word;语法词也即虚词,又称 function/rorm word功能词/式词Chapter Three Lexicon & Morphology 3 . The classification of words (P80) 3.1 According to their variability: variable and invariable words（可变化词和不变词）Variable words are those words which can take inflective endings; invariable words are those that cannot. 3.2 According to their grammatical and semantic properties: grammatical and lexical words(语法 词和词汇词) 词汇词也即实词 ， 又译作 notional/content word ; 语法词也即虚词，又称 function/form word 功能词/形式词