STOCKHOLM, Nov 10 - Swedish Prime Minister Ulf Kristersson will get another week to try to form a new government, the speaker of parliament said on Tuesday, as the opposition has failed in its efforts despite winning the September election.Kristersson was asked by the speaker last week to explore forming a government after the far-right Sweden Democrats dropped its demands for cabinet seats. That potentially makes it easier for Kristersson to persuade the Centre-Party to back his right-wing bloc rather than backing centre-left opposition leader Magdalena Andersson.Kristersson's bloc lost its majority in a September election but Social Democrat leader Andersson...