Subject	courtship
Predicate	has_property
Object	necessary
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7420
Neighborhood Sigma	1.0000
Local Sigma	0.7420
Example Sentences	Sentence Occurrences Source courtship is necessary before marriage 1 Google Autocomplete courtship is necessary 2 Google Autocomplete courtship is necessary in mammals 1 Answers.com Questions