what is the {start time} for {Samuel Adams} has {position held} as {Governor of Massachusetts} ?
What year did Samuel Adams become Govenor of Massachusetts?
When was Samuel Adams became the Governor of Massachusetts?
SELECT ?d WHERE { resource:Samuel_Adams property:position_held ?d . ?d property:position_held resource:Governor_of_Massachusetts . ?d property:start_time ?d }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q212963> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q887117> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q212963 p:P39 ?s . ?s ps:P39 wd:Q887117 . ?s pq:P580 ?value}