【正确答案】正确答案：Considering the free and bound morpheme, affix is the collective term for the type of formative that can be used only when added to another morpheme, so it is naturally bound. Depending on their position with reference to the root or stem of the word, affixes are generally classified into three subtypes, namely, prefix, suffix, and infix. For examples, "para-" as prefix, "-tion" as suffix, and "-bloomingly-" in word "abso-bloomingly-luty" as infix. Affix can also be classified depending on the distinction between inflectional affixes and derivational affixes. The formal often only add a minute grammatical function to the stem and do not change the word class of the word they attach to; while the latter are very productive in making new words and often change the lexical meaning. For instances, "-s" in words "toys" , "walks" and "John"s" is inflectional affixes, while "-tion" is a derivational affix in word "recitation".

【答案解析】解析：(本题考查词缀的种类。可以从两个角度对词缀进行分类：一种是前缀、中缀和后缀；另一种是屈折词缀和派生词缀。)