Rock formations called geodes are filled with layers of crystals. Which group of words forms the complete predicate?
To determine the complete predicate in a sentence, we need to identify the verb and any words that modify or complete the action of the verb. In this sentence, the verb is "are filled," which describes the action of filling. The words "with layers of crystals" modify and complete the action of the verb. Therefore, the complete predicate in this sentence is "are filled with layers of crystals."
I'll be glad to check your answer.
Hint: Be sure you know what the verb is.