what is the {start time} for {Boa Vista} has {head of government} as {Teresa Surita} ?
Boa Vista, the former head of government at Teresa Surita, started when?
When Boa Vista started as head of government at Teresa Surita?
SELECT ?a WHERE { ?y property:start_time ?a . ?y property:head_of_government resource:Teresa_Surita . resource:Boa_Vista property:head_of_government ?y }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q181056> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P6> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q9086139> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q181056 p:P6 ?s . ?s ps:P6 wd:Q9086139 . ?s pq:P580 ?value}