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

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.

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.