Question: Which office holder's  military branch is Continental Army and vice president is John Adams?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/militaryBranch> <http://dbpedia.org/resource/Continental_Army> . ?uri <http://dbpedia.org/ontology/vicePresident> <http://dbpedia.org/resource/John_Adams>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/OfficeHolder>}