The verb specified from the sentence is a present participial.
Present participial is the form of a verb, ending in -ing in English, which is used in forming continuous tenses, e.g., in I'm thinking, alone in nonfinite clauses, e.g., in sitting here, I haven't a care in the world, as a noun, e.g., in good thinking, and as an adjective, e.g., in running water.
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