Sentence:  `` You 're working up to something , and if you do n't watch out you 'll ruin your whole life one of these days just to prove that the Abernathy family <WSD>is</WSD> superior to everything , even a depression '' . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)