There are two participles in this sentence: 'purring' and 'whining'. A participle is used as an adjective and modifies a noun (purring cat), but it can also be used as a part of past continuous tense (was whining).
(purring) shall be your answer A participle<span> is a form of a verb that is used in a sentence to modify a noun, noun phrase, verb, or verb phrase, and thus plays a role similar to that of an adjective or adverb. It is one of the types of nonfinite verb forms.</span>
