Ergative Verbs: When Objects Become Subjects
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An ergative verb operates in two active patterns. In the transitive pattern, a person, tool, or natural force acts on an object, causing a transformation. In the intransitive pattern, the item undergoing the transformation serves as the grammatical subject, and no object follows. The verb does not require a passive structure or a reflexive pronoun to show that the action occurred.
The morning sun melted the frost on the kitchen window.