Derivational morphemes（派生词素）: In English there are morphemes which change the category, or grammatical class of words. A verb, for example, is formed by adding -en to the adjective black, —blacken, or by adding -ize to the noun computer—computerize. 在英语中，有些词素能改变词的范畴，或词的语法类。例如，在形容词black后加-en就可以构成动词blacken，或者在名词computer后加-ize就可以构成动词computerize。 derivational morphemes 【答案】Derivational morphemes are used to make new words in the language and are often employed to produce words of a different grammatical category from the stem.查看答案