【正确答案】：
AFFIXES ATTACHED TO THE END OF WORDS TO INDICATE GRAMMATICAL RELATIONSHIPS ARE INFLECTIONAL, THUS KNOWN AS INFLECTIONAL MORPHEMES. MODERN ENGLISH IS AN ANALYTICAL LANGUAGE. MOST ENDINGS ARE LOST, LEAVING ONLY A FEW INFLECTIONAL AFFIXES, SUCH AS PLURAL FORMS OF NOUNS -S(-ES), AND THE COMPARATIVE AND SUPERLATIVE DEGREE FORMS OF ADJECTIVES: -ER. -EST. DERIVATIONAL AFFIXES ARE AFFIXES ADDED TO OTHER MORPHEMES TO CREATE NEW WORDS. DERIVATIONAL AFFIXES CAN BE FURTHER DIVIDED INTO PREFIXES AND SUFFIXES.
【题目解析】：加在词尾表示语法关系的词缀发生屈折变化，因此叫内部屈折词缀。现代英语是分析型语言，大多数词尾都消失了，只留下几个内部屈折词缀。例如：规则复数后缀-s（-es）加在名词之后，还有后缀-er/-est两种形式加在形容词或副词后表示其比较级和最高级。派生词缀是加在其他词素上创造新词的词缀。派生词缀还可以进一步分为前缀和后缀。