Sentence:  The book <WSD>is</WSD> by Jerome Weidman and George Abbott , music by Jerry Bock , lyrics by Sheldon Harnick , choreography by Peter Gennaro , scenery , costumes and lighting by William and Jean Eckart , musical direction by Jack Elliott , and the production was directed by Mr. Abbott . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)