Subject	fluoride
Predicate	be added
Object	to the water supply
Modality	Modality Occurrences often 2
Polarity	POSITIVE
Plausibility	0.8646
Neighborhood Sigma	0.8649
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source fluoride is often added to the water supply 2 Google Autocomplete, Answers.com Questions fluoride was added to the water supply 1 Answers.com Questions