Avalent (valency of 0): These are typically meteorological verbs like "rain" or "snow" that don't require any arguments.
Monovalent (valency of 1): Also called intransitive verbs, they require only one argument, usually the subject (e.g., "John sleeps").
Divalent (valency of 2): Also known as transitive verbs, they take two arguments, typically a subject and a direct object (e.g., "Smith bewildered the pedestrians").
Trivalent (valency of 3): These verbs, also called ditransitive, require three arguments, such as a subject, direct object, and indirect object (e.g., "Jones gave the cheese to the mouse").