a unobservant preposition can be used for ringing
preposition is not function_word. verbal_tense_operator is unary_predicate. preposition is function_word. verbal_tense_operator is not unary_predicate. telic_directional_preposition is spatial_preposition. preposition_of is preposition. telic_directional_preposition is not spatial_preposition. telic_durational_preposition is not temporal_preposition. preposition_of is not preposition. telic_durational_preposition is temporal_preposition.