Subject	check
Predicate	has_property
Object	necessary
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9724
Neighborhood Sigma	0.9724
Local Sigma	0.9724
Example Sentences	Sentence Occurrences Source checks and balances are necessary 6 Google Autocomplete checks and balances and separation of powers are necessary 6 Google Autocomplete checks and balances is necessary 2 Answers.com Questions