Subject	tigris river
Predicate	be important for
Object	mesopotamia
Modality	Modality Occurrences some[subj/tigris and euphrates rivers were important for mesopotami] 1
Polarity	POSITIVE
Plausibility	0.1722
Neighborhood Sigma	0.2335
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source tigris and euphrates rivers were important for mesopotamia 2 Answers.com Questions