Unaccusativity is a syntactic notion: a predicate has a single argument position. Inchoativity is a semantic notion: a predicate denotes the beginning of an event. Some verbs are inchoative and unaccusative (e.g., the sauce thickened), but this is a coincidence, not a significant fact.


No, not unless you think that everything that happens has a cause and that you can determine that cause (which is a religious rather than a grammatical thesis).

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