Subject	roof
Predicate	need
Object	to be vented
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9884
Neighborhood Sigma	0.9981
Local Sigma	0.9922
Example Sentences	Sentence Occurrences Source roofs need to be vented 2 Google Autocomplete a roof need to be vented 3 Google Autocomplete