Why is a pradicate can be a verb phrase? I thought the pradicates cannot include in the phrases...

First of all, the word is "predicate."

And, yes, a predicate can be a verb phrase.

A simple predicate is simply the main verb (which follows the subject).

A verb phrase is that main verb (the predicate) and ALL the words that follow it.

Explanation:

     S         V            O

Ex.  I        ate     the pizza.

            [       predicate        ]

go to google if u want the answer

c) problem and solution