Read the sentence. The tall cowboy tipped his hat politely.

Which word of phrase is the complete predicate?

Cowboy

Tipped

Tipped his hat politely

The tall cowboy

I think it might be tipped his hat politely because a predicate is the part of a sentence or clause containing a verb and stating something about the subject.

The predicate of the sentence is the part of it that modifies or gives information about the subject, so it must include a verb and it could also include some modifier. A simple predicate has only a verb or verb phrase; a compound predicate includes two or more verbs; a complete predicate includes not only a verb but also other modifiers that give more information.

Taking all this into consideration, tipped his hat politely is the complete predicate of the sentence.