Mistake 1: Every foreign word is a diptote. Counterexample: لِجَامٌ.
Mistake 2: Every foreign proper name is a diptote. Counterexample: نُوحٌ.
Mistake 3: Genitive always takes kasra. بِإِبْرَاهِيمَ is genitive with fatḥa.
Mistake 4: For the three-letter rule, inspect the final vowel. The relevant condition is the middle letter.
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Four Common Misreadings to Avoid
Diptote Causes — Foreign Origin and Its Conditions
Mistake 1: Every foreign word is a diptote. Counterexample: لِجَامٌ.
Mistake 2: Every foreign proper name is a diptote. Counterexample: نُوحٌ.
Mistake 3: Genitive always takes kasra. بِإِبْرَاهِيمَ is genitive with fatḥa.
Mistake 4: For the three-letter rule, inspect the final vowel. The relevant condition is the middle letter.