Last lesson we learned that a predicate always starts with a verb and so you might ask, why more jargon? Why not just say it's the same thing as a verb? Well, because it can contain more than just a verb. A predicate can contain nouns too, what we might call the "object."
For example:
Cats sing lullabies.
[Subject] Cats...
[Predicate] ...sing lullabies.
"Lullabies" isn't a verb. It's a noun. It's in the predicate. It's the object.
So, while nouns must show up as the subject, nouns can show up in the predicate as the object.
The sentence is still about [subject] cats but this time, we know a bit more about what they [verb] sing. They sing [object] lullabies.
Cats sing lullabies.
[subject] [verb] [object]
[subject] [predicate]
Subject, verb, object. Or more simply, subject, predicate. From this kernel of a clause, this basic simple sentence, we will start to layer on complexities.