Jim Bisso’s The Morphology of Peevology Facebook post says (I’ve added links):
Language Jones does a good job of explaining unaccusative verbs (as opposed to unergative ones). What’s that? Per the article in Wikipedia: “In linguistics, an unaccusative verb is an intransitive verb whose grammatical subject is not a semantic agent. In other words, the subject does not actively initiate, or is not actively responsible for, the action expressed by the verb. An unaccusative verb’s subject is semantically similar to the direct object of a transitive verb or to the subject of a verb in the passive voice.”
For example, in English “the tree fell”, “the window broke”, &c. It is related to the reason why some verbs in, e.g., French or German use “to be” as the auxiliary verb in past tenses, instead of “to have”: “je suis tombé” (I have fallen) versus “j’ai travaillé” (I have worked). (It was first described, in 1978, by David Perlmutter.)
Unaccusative verbs have been mentioned a few times at LH, at length in this 2012 comment by Wimbrel:
In linguistics this distinction is encapsulated in the contrast between unergative and unaccusative verbs, i.e., intransitive verbs whose subject is, from a semantic perspective, the doer (agent) or the experiencer (patient) of the action. In Romance and Germanic languages (like French, Italian, German, and Dutch) that have two different auxiliaries for forming the perfective past (preterite), unergative verbs take “to have” (avere/avoir/haben/etc.) as the auxiliary and unaccusative verbs take “to be” (essere/être/sein/etc.). Vestiges of the unergative/unaccusative distinction seem to have survived as late as Early Modern English (hence “the Lord is come”). Radford’s Syntax: A Minimalist Introduction gives some examples from Shakespeare, like “How chance thou art returned so soon?” (Comedy of Errors, I.ii) “She is fallen into a pit of ink.” (Much Ado About Nothing, IV.i)
The Wikipedia article provides the history of the concept and gives examples in English and other languages, notably Russian: “Unlike the subtle evidence for unaccusatives in English, Russian provides strong tests to determine unaccusativity.” I’m hoping making a separate post of it will help the concept (which was invented just as I was dropping out of grad school) stick in my head. Oh, and that Language Jones video is indeed good; it ends up showing how such verbs are reflected in brain scans, aphasia, and child speech.
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