Sentence:  Mr. and Mrs. Richard B. McConnell and their son-in-law and daughter , Mr. and Mrs. Raymond B. Walker will <WSD>be</WSD> hosts this Tuesday evening at dinner at the State st. home of the Walkers honoring Mrs. McConnell 's debutante niece , Miss Barbara Williams . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)