Sentence:  In private life , Miss Garson <WSD>is</WSD> Mrs. E. E. Fogelson and on the go most of the time commuting from Dallas , where they maintain an apartment , to their California home in Los Angeles ' suburban Bel-Air to their ranch in Pecos , New Mexico . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)