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.

Given Relationship: 'be elect by', Sentence: 'Our Board of Trustees serve in a voluntary capacity and are elected by our voluntary branches or co-opted for their expertise .'
elected

Given Relationship: 'be son of', Sentence: 'James and John , the sons of Zebedee , had traveled with Jesus for three years and still they wanted to assume positions of leadership that would give them great prestige , satisfy their egos , and give them power over others .'
sons

Given Relationship: 'be imprison by', Sentence: 'There is also the case where Saruman imprisons Gandalf , but inexplicably does not attempt to take the Ring of Fire from Gandalf , even tho Saruman coveted the Ring and begrudged the fact that Cirdan had given it to Gandalf .'

imprisons