形态学Morphology1词素morpheme词素是单词的最小的有意义的组成部分
Childlike=Child+like2词根经常被看做单词的一部分，它本身有清楚的确定的意义但却不能被单独使用
如bio-,tri-,aero-自由词素是独立的意义单位,自身能够单独使用,如drink,stand,moon等3屈折词缀用来表明各种各样的语法关系或范畴，如数、时态、级和格等
4前缀prefix一般来说，前缀只是改变词的意义，但并不改变其词类
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