Did {Rome} {head of government} {Ignazio Marino}?
Has Ignazio Marino ever beem the head of government of Rome?
Was Ignazio Marino the head of government of Rome?
ASK WHERE { resource:Rome property:head_of_government resource:Ignazio_Marino }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q220> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P6> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q405098>. } 
ASK WHERE { wd:Q220 wdt:P6 wd:Q405098 }