Predicate rap time!
Are you ready?
Here, let's go!

A predicate is one of the two main parts
Of a sentence, the other being the subject,
Which the predicate modifies

For the simple sentence "john is yellow",
"john" acts as the subject
And "is yellow" acts as the predicate
A subsequent description of the subject, headed with the verb!

In current linguistic semantics
A predicate is an expression
That can be true of something
Thus the expression "is yellow" or "like broccoli"
Are true of those things
That are yellow, or like broccoli, respectively

This notion is closely related to the notion of a predicate in formal logic
Which includes more expressions than the former one