1. A computer-implemented method, comprising: receiving a voice query that includes a pronoun; determining a stress score for the pronoun that reflects an extent to which the pronoun was stressed in the voice query; identifying two or more candidate entities that are associated with two or more answers that a search engine generates for two or more corresponding voice queries that preceded the voice query; selecting, as a particular entity, (i) an entity associated with an answer that the search engine generates for an immediately preceding voice query when the stress score satisfies a predetermined threshold, or (ii) an entity associated with an answer that is generated for a voice query that is not the immediately preceding voice query when the stress score does not satisfy the predetermined threshold; revising the received voice query to refer to the particular entity that was selected based at least on the comparison of the stress score to the predetermined threshold; and providing one or more query results that are responsive to the revised voice query for output on a client device.