19. The computer-implemented method of claim 18 , further comprising transmitting, by the server system and for use by the remote computing device, the textual query.
18. A computer-implemented method, comprising: obtaining, at a server system, information that identifies a level of inclusion of a particular term in queries that were received by a search engine system as search requests and that are associated with a recent period of time, to an exclusion of queries that were received by the search engine system as search requests and that are associated with time outside of the recent period of time and before the recent period of time; modifying, by the server system, a speech recognition model to revise occurrence data for the particular term based on the level of inclusion of the term in the queries that are associated with the recent period of time wherein inclusion of the particular term in the queries that are associated with the recent period of time influences the occurrence data more strongly than use of the particular term in queries that are associated with time outside of the recent period of time and before the recent period of time; receiving, at the server system and from a mobile computing device, a verbal query; translating, by the server system and using the modified speech recognition model, the verbal query into a textual query, wherein the textual query includes the particular term; and determining whether the textual query represents a verbal search query or whether the textual query represents a verbal system command.