Sentence words have a hierarchy of possibly concatenated smaller groups {constituent grammar} {immediate constituent grammar}.
parts of speech
Constituent grammar uses subject and predicate as fundamental categories. Other grammatical categories derive from them.
rules
Rule sequences build word-group hierarchies. Sentence types have grammar rules, which speakers use for sentence generation, and which hearers use for sentence analysis. Sentence-type rules put high-level word groups in sequences. Sentence-type rules can have necessary parts, optional parts, and branching parts. Second-level grammar rules order words in word groups. Third-level grammar rules order words in subgroups, and so on.
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Date Modified: 2022.0224