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.

Example Input: Sentence: 'Prague is the capital city of the Czech Republic , and a great place for tax free shopping .', Argument/Subject 1: 'prague', Argument/Subject 2: 'czech republic'
Example Output: be capital city of

Example Input: Sentence: 'Sen. McCain , who wants to be our next president , has skipped this vote three times now .', Argument/Subject 1: 'mccain', Argument/Subject 2: 'president'
Example Output: want to be

Example Input: Sentence: 'Vacancies may be filled or new officers created and filled at any meeting of the Board .', Argument/Subject 1: 'vacancy', Argument/Subject 2: 'board'
Example Output:
be fill by