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.

Q: Given Relationship: 'be invent by', Sentence: 'When Tim Berners-Lee invented the World Wide Web , he gave the world a new medium for publishing content , both personal and professional .'

A: invented
****
Q: Given Relationship: 'speak at', Sentence: 'It is true that Mahmod Ahmadinejad is scheduled to speak at Columbia this Monday .'

A: speak
****
Q: Given Relationship: 'be son of', Sentence: 'In 1706 , one-half interest was sold to John Watson , and in 1716 , Mr. Watson and James Warren , son of Nathaniel , sold to John Cushman .'

A:
son
****