Sentence:  One day , Ching had told him ( smiling , patting him on the back ) as they walked to the weekly conference of squad leaders , `` Keep it up , your squad <WSD>is</WSD> good , one of the best , keep it up , keep up the good work '' . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)