Did {John_Wayne} {partner} {Marlene Dietrich}?
Are John Wayne and Marlene Dietricha in a relationship?
Is John Wayne and Marlene Dietricha a couple?
ASK WHERE { resource:John_Wayne property:unmarried_partner resource:Marlene_Dietrich }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q40531> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P451> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q4612>. } 
ASK WHERE { wd:Q40531 wdt:P451 wd:Q4612 }