Task: Pos Tagging
Input (English): Sentence: The advertising farce of how much he loved Linda ( woman whose quality he did not deserve ) , was exposed {{ when }} it was known that Paul had an affair with Heather Mills , Linda 's intimate friend , with whom McCartney went on a trip to New York and to whom he bought things and presents , while he was still mourning for his " dear Linda " . 
Word: when
Output (English): WRB