مَفْعُولٌ فِيهِ, also called a ظَرْفٌ, is a mansub noun that indicates the time or place of an action.
- If it tells when, it is ظَرْفُ زَمَانٍ — an adverb of time.
- If it tells where, it is ظَرْفُ مَكَانٍ — an adverb of place.
This level develops adverbs of time. Place is introduced only so the two branches are not confused.