instruction:
Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.
question:
Relationship: 'be president of', Argument/Subject 1: 'obama', Argument/Subject 2: 'america'
answer:
Barack Obama will be sworn as America 's first black president Tuesday under the tightest security ever , shielded by a new , heavily armoured Cadillac limousine , bullet-resistant glass , fighter planes overhead and Secret Service SWAT teams toting automatic weapons .

question:
Relationship: 'be wife of', Argument/Subject 1: 'sif', Argument/Subject 2: 'thor'
answer:
Sif was the god Thor 's wife .

question:
Relationship: 'be city in', Argument/Subject 1: 'auckland', Argument/Subject 2: 'new zealand'
answer:
Auckland , New Zealand 's largest city , has much to offer water lovers .