–lify, -tion, -able, etc. are[填空1]affixes.
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–es, -est, -ing, etc. are [填空1]affixes.
Morpheme is the smallest [填空1] unit of language.
A[填空1] morpheme means a morpheme which can occur alone.
[填空1] morphemes are actually lexical morphemes. They have a very specific semantic content.
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