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.

[Q]: Sentence: 'Greensboro is served by the Piedmont Triad International Airport .', Argument/Subject 1: 'greensboro', Argument/Subject 2: 'piedmont triad international airport'
[A]: be serve by

[Q]: Sentence: 'The election of Illinois Senator Barack Obama as America 's 44th president is astounding , historical , implausible , improbable and completely without precedent in the history of the United States .', Argument/Subject 1: 'obama', Argument/Subject 2: 'america'
[A]: be president of

[Q]: Sentence: 'This feature of the stories is so odd that Christians come to say that both Jesus and the Father are together one God , so that God 's sacrifice is first of all a sacrifice of himself .', Argument/Subject 1: 'god', Argument/Subject 2: 'jesus'
[A]:
be father of