All the sentences are from " The Independent":
Present Perfect:
-The Conservatives have opened up a five-point lead over Labour after an attempted fightback.
-We may finally have seen the point where the Conervatives have erased that memory.
Past Simple Passive:
-If the most recent poll results were repeated at an election, Labour would win...
- The diploma was announced at Buckinham Palace, wich is, unsurprisingly, one of the nation's leading employers of butlers.
Present Perfect Passive:
-In the past 10 years, however, " buttling" has been reinvented to accomodate many activities.
-The drinkers of Virginia Water and their well-heeled neighbours in the prosperous Runnymede area of Surrey have been branded problem drinkers.