● Study this chart of agreement between the adjective and the noun it describes in all four ways:
English phraseArabic phraseGender and numberGrammatical case
The righteous boyاَلْوَلَدُ الصَّالِحُMasculine singularNominative (marfūʿ)
The righteous girlاَلْبِنْتُ الصَّالِحَةُFeminine singularNominative (marfūʿ)
The two righteous boysاَلْوَلَدَانِ الصَّالِحَانِMasculine dualNominative, with the final nūn
The two righteous girlsاَلْبِنْتَانِ الصَّالِحَتَانِFeminine dualNominative, with the final nūn
The righteous boysاَلْأَوْلَادُ الصَّالِحُونَMasculine pluralNominative (marfūʿ)
The righteous girlsاَلْبَنَاتُ الصَّالِحَاتُFeminine pluralNominative (marfūʿ)