Sentence:  Recounting personal observations of clearance work , the Councilman cited instances of inefficient use of equipment or supplies by poorly trained workers and urged that plow blades <WSD>be</WSD> set so they do not leave behind a thin layer of snow which eventually freezes . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)