TASK DEFINITION: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
PROBLEM: Sentence: 'Liberia primary language is English , which is taught in the school system .', Argument/Subject 1: 'english', Argument/Subject 2: 'liberium'

SOLUTION: be language of

PROBLEM: Sentence: 'He had also been the architect of Japan 's stunningly successful sneak attack on the US Pacific Fleet at Pearl Harbor .', Argument/Subject 1: 'japan', Argument/Subject 2: 'pearl harbor'

SOLUTION: attack

PROBLEM: Sentence: 'Barack Obama has Just been elected President of the United States of America .', Argument/Subject 1: 'barack obama', Argument/Subject 2: 'unite state of america'

SOLUTION:
elect president of