问题：

Please distinguish inflectional affix and derivati

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答案：

First, inflectional affixes are generally less productive than derivational affixees: they often only add a minute or delicate grammatical function to the stem.However, derivational affixes are very productive in maing new words. Second, inflectional affixes do not change the word class of the word they attach to, such as "flower" and "flowers", whereaa derivational affixes might or might not change the word class of the word they attach to, such as "small" and "smallness", "brother" and "brotherhood". Third, whether one should add inflectional affixes or not depends very often on other factors within the phrase or sentence. However, derivational affixes are more often based on simple meaning distinctions. Fourth, in English, inflectional affixes are mostly suffixes, which are always word final. But derivational affixes can both be prefixes and suffixes.