构词法
前缀：通常改变词义 后缀：通常改变词性
a- : amoral 不道德的 apathy 无情
dis: dishonest, disappear, disloyal, disorder
in/ir/ il/im: incorrect injustice impossible illegal irregular
non: non-scientist non-smoker non-stop un: unhappy, unreal, unofficial, unfair
3）贬义前缀 mal-, mis-, pseudo-(伪…,假…) maltreat，malfunction 机能失常，malnutrition mislead, misinform, misfortune
pseudoscientific, pseudo-realism
well: well-known, well-informed
5) 表示态度或倾向的前缀
anti-(反对，防止)：antiwar, antiaircraft防空袭的 contra-(反对，相反)：contradict, contra-dance counter-(反对，相反)：counteraction反作用 pro-(亲，赞成)：pro-American, pro-slavery
6) 表示时间或顺序
ex-表示前任的，从前的：ex-wife, ex-president fore-前，先：forefather, forethought深谋远虑 post-后的：post-war, postgraduate
pre-前的：pre-war, premature
re-再：remarriage, reconsider
7) 表示地点的前缀
extra-以外的：extra-official, extralegal
