(1) beth is not a sailor

SENTENCE_NT'beth is not a sailor'
    VERB_NT'is not' {verb 'be' 3p s act IS_TENSE -ve}
    PROPER_NOUN_NT'beth' {proper nom/acc f s}
    COMMON_NOUN_NT'sailor' {indefinite 'a' n/m/f nom/acc s} {common nom/acc m s}