How do the five forms arise?

Five forms of additional wording

• Without opposition: maqbūl, with the stated condition.
• In opposition: the more reliable narrator's report is maḥfūẓ.
• A reliable narrator has two cases: shādhdh against a more reliable narrator, maʿrūf against a weak one.
• The weak narrator's opposing report is munkar.

This completes the five forms in this classification, not the total number of all Hadith categories.