There are nine causes of منعِ صرف. A noun is ghayr munsarif when it has two recognized causes, or one cause that counts as two.
Two examples are enough for this first step:
- إِبْرَاهِيمُ combines proper-name status with foreign origin.
- مَسَاجِدُ belongs to a plural pattern that counts as two causes.
This level uses these established examples to teach case behavior. The detailed cause-by-cause classification remains separate, so do not classify an unfamiliar noun by guesswork.