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.

Input: Consider Input: Given Relationship: 'be president of', Sentence: 'Tomorrow Barack Obama will become president of the United States .'

Output: president

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

Output: become

Input: Consider Input: Given Relationship: 'be island in', Sentence: 'Residents of the Caribbean island of Montserrat call one of their edible frog species mountain chicken , but this amphibian is now endangered .'
Output: island