TASK DEFINITION: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
PROBLEM: Given Relationship: 'be president of', Sentence: 'A month after writing this , he became President of the United States when Richard M. Nixon resigned .'

SOLUTION: President

PROBLEM: Given Relationship: 'become', Sentence: 'But how did the Apostle Paul become a Christian and an Apostle ?'

SOLUTION: become

PROBLEM: Given Relationship: 'present at', Sentence: 'Paper presented at Workshop on Economics , IUCN General Assembly , 4-5th February , Costa Rica .'

SOLUTION:
presented