The correct answer is the role of adjective. Both non-finite verbs can perform the role of adjective in a sentence. The following examples show this role:
Present participle as adjective, which can be recognized from its "-ing" ending:
Look at the <u>reading</u> boy.
Past participle as adjective, which are formed by adding "-ed" to the verb:
Look at the <u>washed</u> car.
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