Final answer:
The subject of the sentence 'Here is a perfect example of a raw gold nugget' is 'example.' The verb in the sentence is 'is,' and there are no subject complements.
Step-by-step explanation:
In the sentence 'Here is a perfect example of a raw gold nugget,' the subject is 'example.' The verb in the sentence is 'is,' which is a form of the linking verb 'to be.' The adverbial in the sentence is 'here,' which tells us the location of the example. There are no subject complements in this sentence.