«الخبر إما أن يكون جملة فعلية أو اسمية»
A report takes either a verbal or a nominal sentence form.
A verbal sentence is organized around a verb, as in “خَرَجَ الطَّالِبُ” (“The student went out”). It typically presents the occurrence of an act or event.
A nominal sentence centers on a subject–predicate relation, as in “الطَّالِبُ مُجْتَهِدٌ” (“The student is diligent”), ascribing diligence to the student.
The distinction concerns the characteristic rhetorical possibilities of event-presentation versus predicative establishment, not simply the number or shape of words.