"This is a smart man."
Translation:He kāne akamai kēia.
It's very complicated since a single word might be able to act like a verb, a noun, an adjective, or an adverb depending on where it is in the sentence. And for a "to be" sentence ("this is that") there's not really a verb at all. Perhaps the following breakdown will help you understand the pattern in this sentence:
He kāne "A man"
He kāne kēia. "This is a man."
He kāne akamai "A smart man"
He kāne akamai kēia. "This is a smart man."