问答题 Do the suffixes -able in workable, -ness in workableness change the word class of the words to which they are attached? Are they bound morphemes or free morphemes? Inflections or derivations?

【正确答案】The suffixes -able in workable and -ness in workableness have changed the word class of the words to which they are attached．They are bound morphemes，though -able is both a free and bound morpheme．They are derivational morphemes．

【答案解析】[解析] 本题考查的是词素和构词法。英语中的词索可分为黏着词素和自由词素。黏着词索又可进一步分为派生曲折两类。派生词素主要通过改变意义或者词性来创造新词。而曲折词素既不改变意义也不改变词性，只是给词加上一些诸如复数，过去式之类的语法信息。派生词缀可以是前缀也可以是后缀。曲折词缀只能是后缀，表示单词的性、数、格。