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动词前缀+名词→动词
be- ( = to take away ) + head n . → behead ( = to take one's head away) vt.砍…的头 de- ( = to make. . .off) + rail n .→ derail ( = to make a train off the rail) vt. 使(火车)脱轨
dis- (to take away) + arm n . → disarm ( = to take one's arms away) vt.缴…的械
2. 名词性前缀对派生词词性的影响。名词性前缀多是希腊语源的术语前缀,它往往与名词性词基相结合,对词基起限定或修饰作用,构成相当于“限定词+名词中心词”短语的名词派生词。可见,名词性前缀往往从属于词基,它一般不改变词基单词的词性。例如:
auto- ( = self) + biography n . → autobiography ( = a biography of one's self) n .自传
bio- ( = life) + magnetism n . biomagnetism ( = the branch of magnetism about life) n .生物磁学
ge- ( = earth ) + -o- + dynamics n. geodynamics ( : the branch of dynamics about the earth) n. →地球动力学
3. 修饰性的前缀(包括数词性前缀、形容词性前缀与副词性前缀)对派生词词性的影响。这类前缀与中心词相结合构成的派生词相当于“修饰语+中心词”的短语,如“数词+名词”、“形容词+名词”、“副词+动词”、“副词十形容词”等。显然,这些短语的语法功能取决于“中心词”即词基的词性。因此,这类派生前缀一般不影响词基单词的词性。各举一例说明:
tri- ( = three) + angle n . → triangle ( = a plan figure with three angles) n . 三角形 mal- ( = bad) + adjustment n. → maladjustment ( = bad or faulty adjustment) n .失调
4. 介词性前缀对派生词词性的影响。介词性前缀既可与动词性词基又可与名词性词基相结合,所以情况较为复杂,现分别探讨如下:
1)介词性前缀与动词性词基相结合,一般构成相当于“动词中心词+介词”短语的动词派生词,这时介词性前缀对词基的属性不产生影响(有时可将不及物动词变成及物动词)。惟一的例外是:介词性前缀a-与动词结合时会生成相当于“介词+动名词宾语”短语的补语形容词。这时,介词性前缀改变了词基单词的词性。例如:
a- (=on) + blaze v. → ablaze ( =on blazing) a.着火的;闪耀的
a- (=in) + sleep v. → asleep ( = in sleeping) a .睡着的,睡熟的