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Answer the following questions. Your answers should be clear and short.Prefixation and suffixation are two subclasses of affixation. Please define prefixation and suffixation and explain the difference between them. Use “polite—impolite”, “happy—happiness” to illustrate your point.
【正确答案】：

PREFIXATION IS THE FORMATION OF NEW WORDS BY ADDING PREFIXES TO STEMS. PREFIXATION DOES NOT GENERALLY CHANGE THE WORD CLASS OF THE STEM; IT ONLY MODIFIES ITS MEANING. E.G. POLITE-IMPOLITE.

SUFFIXATION IS THE FORMATION OF NEW WORDS BY ADDING SUFFXES TO STEMS. SUFFIXATION CHANGES THE WORD CLASS INSTEAD OF ITS MEANING. E.G. HAPPY-HAPPINESS.

【题目解析】：前缀法一般不会改变词干的词类，它只会修改它的意思。例如，有礼貌的-无理的。 另一方面，后缀改变了词类而不是它的意思。例如，幸福的-幸福。