Consider one statement:
إِنَّ الطَّالِبَ قَرَأَ الْكِتَابَ
Indeed, the student read the book.
It can be examined from several angles:
1. Report predication — Why has emphasis been used?
2. Subject of predication — Who is spoken about, and how is that person presented?
3. Predicate — What action is attributed to the student?
4. Verbal complements — Why is the object of reading mentioned?
The chapters isolate distinct questions that may coexist in a single utterance.