构词法和有趣的词源故事
1.表示否定意义的前缀
1)纯否定前缀a-, an-, asymmetry(不对称)anhydrous(无水的)dis- dishonest, dislikein-, ig-, il, im, ir, incapable, inability, ignoble, impossible, immoral, illegal, irregularne-, n-, none, neither, nevernon-, noesenseneg-, neglectun- unable, unemployment