Sentence:  Or , equally often , a concretistic seeming , particularistic seeming statement may consist , with its mundane exterior , in a form of poetry - may <WSD>be</WSD> full of meaning and emotion when interpreted as a figurative expression : a metaphor , a simile , an allegory , or some other symbolic mode of speaking . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)