Morpheme(词素或语素)

Allomorph——语素变体 Allomorph——语素变体
Some 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: map----maps [s] dog----dogs [z] watch----watches [iz] mouse----mice [ai] ox----oxen [n] tooth----teeth sheep----sheep Each of the underlined part is called an allomorph of plural morpheme.
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Free morpheme & bound morpheme
Free morpheme----is one that may constitute a word (free form) by itself, such as bed, tree, sing, dance, etc. Bound morpheme----is one that may appear with at least one other morpheme. They can not stand by themselves, such as “-s” in “dogs”, “al” in “national”, “dis-” in “disclose”, “ed” in “recorded”, etc.
Morpheme(词素或语素）--the Morpheme(词素或语素）--the minimal unit of 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. 1-morpheme boy, desire 2-morpheme boy+ish, desir(e)+ble