Just some terminology before the actual question so you understand what "predicate nominative" really means. Subject: Discussing the one who does something or is something in the sentence. Predicate: Discussing the action which the subject does in the sentence.
In this sentence: Subject: Chess Predicate: has always been one of Henry's favorite board games. Nominative: Describing the subject (words following <em>to be, to seem, </em>etc.) Accusative: Taking a direct object (such as <em>to have, to see, to tell, </em>etc.) Dative: Taking an indirect object (such as <em>to go <u>to</u>, </em><em>to look <u>at</u>, </em><em>to say <u>to</u>, </em>etc.) Genitive: Possessing sth. (<em>Henry's, his, of the United States, </em>etc.) <em>*note that nominative uses linking words and accusative/dative use action verbs.</em>
If you look in the sentence we have here, <em>been</em> is a paste tense of <em>to be</em>. It is describing the subject as being one of Henry's favorite board games, and is thus using the nominative.
However, the term predicate nominative is a bit more specific than that, it's not referring to that entire phrase. It is just the object of that predicate, what the subject is being renamed to. Usually you can substitute <em /><em>equal</em><em>s</em> in the sentence and it should still work.
In this sentence, the predicate nominative is <u>games</u>. (Chess = game)
Stick Bug. Stick bugs are perhaps one of the better known examples of insect mimicry. Commonly referred to as walking sticks, stick insects began imitating plants as early as 126 million years ago. Their twig-like appearance helps to defend them against predators that hunt by sight.It is common to see them walk in a swaying motion, pretending to be a twig caught by the wind. Other stick insect species have lichen-like outgrowths on their bodies that help camouflage them on tree bark. ... Echolocation used by bats can help them hone in on the tiny noises made by stick insects for a tasty meal.