What is the predicate word in this sentence

Peanut butter is rich in protein?

Rich or protein?

The simple predicate is always the verb.

The verb in this sentence is IS.

The complete predicate is IS RICH IN PROTEIN.

The directions ask for the predicate word?

Please re-read Ms Sue's first and second sentences ... several times if you have to.

Strange directions.

The only answer can be IS.

We are to underline the verb and identify the predicate noun or adjective?

Ahh -- that makes a big difference!

Since "in protein" is a prepositional phrase, the predicate noun or adjective cannot be protein.

What do you think the predicate adjective is?

What about ninety percent of its ingredients are crushed peanuts.

Crushed or peanuts and why?

Peanuts tells what most of the ingredients are. Crushed is an adjective modifying this predicate noun.

The predicate word in the sentence "Peanut butter is rich in protein" is "is". The predicate word includes the finite verb (or linking verb) and any words or phrases that complete the verb's meaning. In this case, "is" is the finite verb, and "rich in protein" completes its meaning. To determine the predicate word, you can ask yourself which word or words provide information about the subject and what it is doing or being. In this sentence, "is" connects the subject "peanut butter" to the description "rich in protein".