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: 'Liberia primary language is English , which is taught in the school system .', Argument/Subject 1: 'english', Argument/Subject 2: 'liberium'
Example Output: be language of

Example Input: Sentence: 'Greensboro is served by the Piedmont Triad International Airport .', Argument/Subject 1: 'greensboro', Argument/Subject 2: 'piedmont triad international airport'
Example Output: be serve by

Example Input: Sentence: 'Lithuanian is the official state language of the Republic of Lithuania .', Argument/Subject 1: 'lithuanian', Argument/Subject 2: 'lithuanium'
Example Output:
be language of