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1、Morpheme(Morpheme(词素或语素）词素或语素）-the minimal unit -the minimal unit of meaningof meaning-Words are composed of morphemes. A morpheme is a meaning and a stretch of sound joined together. Words may consist of one morpheme or more morphemes, e.g.l1-morpheme boy, desirel2-morpheme boy+ish, desir(e)+bleFre
2、e morpheme & bound morphemeFree morpheme & bound morphemelFree morpheme-is one that may constitute a word (free form) by itself, such as bed, tree, sing, dance, etc.lBound morpheme-is one that may appear with at least one other morpheme. They can not stand by themselves, such as “-s” in “dogs”, “al”
3、 in “national”, “dis-” in “disclose”, “ed” in “recorded”, etc. AllomorphAllomorph语素变体语素变体lSome morphemes have a single form in all contexts, such as “dog, bark, cat”,etc. In other instances, there may be some variation, that is, a morpheme may have alternate shapes or phonetic forms. They are said to be the allomorphs of the morpheme, the plural morpheme may be represented by:lmap-maps sldog-dogs zlwatch-watches izlmouse-mice ailox-oxen nltooth-teeth lsheep-sheeplEach of the underlined part is called an allomorph of plural morpheme.
