Avoiding ontological commitment, however, is not the only role that paraphrase plays in ontological disputes. The method of paraphrase has also been used to bring hidden ontological commitments of ordinary discourse to the fore. One prominent example is Davidson's (1967) argument that action sentences are committed to an ontology of events. For example, to explain the logical inference from “John walked slowly” to “John walked”, we should treat the adverb ‘slowly’ as a description of an event over which these sentences tacitly quantify. Paraphrases of action sentences into the regimented portion of our language will thus be ontologically committed to events. A second well-known example is Lewis's argument from Counterfactuals that modal discourse, as he understands it, is committed to possible worlds: 