Question

select the linking verb and the predicate noun or predicate adjective.
the \forbidden island\ of niihau, a private island with few inhabitants, is geologically the oldest of the hawaiian islands.
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Explanation:

1. First, identify the linking verb. In the sentence, "is" functions as a linking verb, connecting the subject ("The 'Forbidden Island' of Niihau") to the predicate.
2. Then, identify the predicate adjective. The word "oldest" is an adjective (in its superlative form) that describes the subject and follows the linking verb "is". The phrase "the oldest of the Hawaiian Islands" contains the predicate adjective "oldest" (with the article "the" and the prepositional phrase "of the Hawaiian Islands" modifying it, but the core predicate adjective is "oldest").

Answer:

Linking verb: is; Predicate adjective: oldest