Subject	helicopter
Predicate	need
Object	tail rotor
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9880
Neighborhood Sigma	0.9880
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source helicopters need a tail rotor 4 Google Autocomplete a helicopter need a tail rotor 7 Google Autocomplete helicopters need tail rotors 2 Answers.com Questions