ASK WHERE { <http://dbpedia.org/resource/Jordan_River> <http://dbpedia.org/ontology/leftTributary> <http://dbpedia.org/resource/Dan_River_(Middle_East)> }
Does Dan River flow into the Jordan Valley?
ASK WHERE { resource:Jordan_River property:left_tributary resource:Dan_River_(_Middle_East) }
Yes
[Yes], Dan River flow into the Jordan Valley.
[Yes] the Dan River does flow into the Jordan Valley.