Final answer:
The complete predicate in the sentence is 'explains the author's connection to British royalty.' It includes the verb 'explains' and the descriptive phrase that follows.
Step-by-step explanation:
The complete predicate of a sentence tells us what the subject does or is like. To select the words that make up the complete predicate, look for the verb and whatever follows that relates to the verb or completes the thought about the subject. In the provided sentence, "The introduction to this book about England explains the author's connection to British royalty," the complete predicate is "explains the author's connection to British royalty."
Predicates can be simple or compound and include verbs, direct objects, indirect objects, and any modifiers.
It's important to note that understanding predicates is essential for mastering sentence structure as they provide critical information that rounds out what is stated by the subject. The subject of a sentence names something like 'introduction,' and the predicate puts forth the action, state, or description that pertains to that subject.