Sentence:  But watching Mrs. Cyril Ring , Berniece Dalton Janssen , Mrs. Robert Jarvis , Mrs. Walter Adams order low-calory seafood , no bread , I could see the Ziegfeld Girls of 1920 were determined to <WSD>be</WSD> glamorous grandmothers of 1961 . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)