description of the structure of a language, consisting of the sounds (see phonology
); the meaningful combinations of these sounds into words or parts of words, called morphemes; and the arrangement of the morphemes into phrases and sentences, called syntax. School grammars for the speakers of a standard language (e.g., English grammars for English-speaking students) are not descriptive but prescriptive, that is, they are rule books of what is considered correct. Such grammars have popularized many unsound notions because they often fail to take into account common usage and they do not differentiate language styles and levels, such as formal or colloquial; standard, nonstandard, or substandard; or dialect differences.
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