The predicate consists of a statement about the subject in a sentence, and it usually comes after the verb - which in this case is the to-be verb <em>was</em>.
The subject of the sentence is <em>"The package in the brown box" </em>(The object that's being talked about, along with its description).
The predicate of the sentence states something about this package (its weight compared with other objects).
The predicate is was by far the heaviest. The predicate of the sentence is usually the verb clause (it's the verb and everything that comes after; talking about the subject). hope this helps:)
