Did {Normandy_landings} {participant} {United Kingdom}?
Did the United Kingdom take part in the Normandy landings?
Was a participant of the the Normandy landings the United Kingdom?
ASK WHERE { resource:Normandy_landings property:participant resource:United_Kingdom }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q16470> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P710> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q145>. } 
ASK WHERE { wd:Q16470 wdt:P710 wd:Q145 }