Noun Cases (I'rab) in Arabic

Overview

Arabic is a case-marking language, meaning that nouns change their endings to indicate their grammatical function in a sentence. This system is called الإعراب (al-i'raab) and distinguishes three cases: nominative (مرفوع), accusative (منصوب), and genitive (مجرور). Case endings appear as short vowels at the end of words.

At the A2 level, understanding noun cases helps you read formal Arabic correctly and appreciate the grammatical logic of the language. In everyday spoken Arabic, case endings are largely dropped, but they remain essential in formal speech, news broadcasts, religious texts, and academic writing.

The three cases correspond roughly to subject (nominative), direct object and certain complements (accusative), and possession or after prepositions (genitive). Indefinite nouns show case with tanwin (double vowel marks), while definite nouns use single vowel marks.

How It Works

The Three Cases

Case	Arabic Name	Ending (definite)	Ending (indefinite)	Function
Nominative	مرفوع	-u (الطالبُ)	-un (طالبٌ)	Subject, predicate of nominal sentence
Accusative	منصوب	-a (الطالبَ)	-an (طالبًا)	Direct object, predicate of كان, after certain particles
Genitive	مجرور	-i (الطالبِ)	-in (طالبٍ)	After prepositions, second noun in idafa

Case Markers on Different Noun Types

Noun Type	Nominative	Accusative	Genitive
Regular singular	ُ / ٌ	َ / ً	ِ / ٍ
Sound masc. plural	ون	ين	ين
Sound fem. plural	اتُ	اتِ	اتِ
Dual	انِ	يْنِ	يْنِ
Diptote (some patterns)	ُ	َ	َ (not kasra!)

Examples in Context

Arabic	English	Note
جاء الطالبُ.	The student came.	Nominative (subject)
رأيت الطالبَ.	I saw the student.	Accusative (direct object)
مررت بالطالبِ.	I passed by the student.	Genitive (after preposition)
كتابٌ جديدٌ	a new book	Indefinite nominative (tanwin)
قرأت كتابًا.	I read a book.	Indefinite accusative
في مدرسةٍ كبيرةٍ	in a big school	Indefinite genitive
الطالبُ ذكيٌّ.	The student is smart.	Subject in nominative
كان الجوُّ باردًا.	The weather was cold.	Subject of كان nom., predicate acc.
ذهبت إلى البيتِ.	I went to the house.	Genitive after إلى
كتابُ الطالبِ	the student's book	Idafa: first nom., second gen.

Common Mistakes

Wrong	Right	Why
Using same ending everywhere	Matching case to grammatical function	Each function requires a specific case
Genitive after كان predicate	Accusative after كان	The predicate of كان is accusative, not genitive
Nominative after prepositions	Genitive after prepositions	Prepositions always govern genitive
Adding kasra to diptotes in genitive	Using fatḥa for diptotes	Certain noun patterns (like أفعل) take fatḥa instead of kasra in genitive

Usage Notes

In everyday spoken Arabic across most dialects, case endings are dropped entirely. You will hear كتاب without any final vowel rather than كتابٌ or كتابَ. However, case endings are preserved in formal contexts: news reading, religious recitation, academic lectures, and official speeches. Understanding i'raab is therefore essential for consuming formal Arabic media and literature.

Practice Tips

• Start by identifying the case of every noun in short Quranic verses or textbook sentences. Label each noun as subject, object, or prepositional complement.
• Practice reading voweled texts aloud, pronouncing all case endings clearly. This trains your ear and tongue for formal Arabic.
• Focus on the three most common triggers: subjects are nominative, objects are accusative, and prepositions trigger genitive. These three rules cover most situations.

Related Concepts

• Nominal Sentences
• Genitive Construction (Idafa)
• إنّ and Sisters
• Circumstantial Clauses (Hal)
• Specification (Tamyiz)
• Vocative (Nida)
• Emphasis (Tawkid)
• Absolute Object (Maf'ul Mutlaq)