Subject	national park
Predicate	be set up
Object	in the 1950s
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.5690
Neighborhood Sigma	0.6025
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source national parks were set up in the 1950s 1 Answers.com Questions