Possession by Joining Two Nouns

Level 1

The Idafa (الإضافة) joins two nouns together. The first noun is the thing possessed, and the second noun is the possessor. The first noun never takes 'al-' or 'tanween', while the second noun is always in the genitive case.

How It Works

The Idafa (annexation) is one of the most fundamental structures in Arabic. It consists of two parts: the Mudaf (the thing being defined) and the Mudaf Ilayhi (the definer).

Rules for the First Noun (Mudaf):

  • It never takes the definite article al-.
  • It never takes tanween (the double vowel ending).
  • It takes the case ending required by its position in the sentence (nominative, accusative, or genitive).
  • If it ends in a ta marbuta (ة), the 't' sound must be pronounced because the two nouns are read as a single unit in connected speech. If you pause after the first noun, it reverts to a silent 'h' sound.
  • Nun Deletion: If the first noun is a dual or a sound masculine plural, the final Nun (ن) must be dropped (e.g., 'teachers of the school' becomes مُدَرِّسو المَدْرَسَة instead of مُدَرِّسون).

Rules for the Second Noun (Mudaf Ilayhi):

  • It is always in the genitive case (majrur), usually ending in a kasra.
  • It can be definite (with al-) or indefinite. If the second noun is definite, the whole phrase is definite.
  • Pronouns: Attaching possessive pronoun suffixes to a noun is also a form of Idafa, where the noun is the Mudaf and the pronoun is the Mudaf Ilayhi.

Advanced Structures:

  • Idafa Chains: You can link more than two nouns together in chains. In these cases, every noun except the last follows the Mudaf rules (no article, no tanween), and every noun except the first is in the genitive case.

Important Note: Nothing can come between the two nouns of an Idafa. If you want to describe the first noun with an adjective, the adjective must come after the entire phrase.

Examples (4)

  1. كِتَابُ الطَّالِبِ

    The student's book

    Word by Word: Book (of) the student

    Notice that 'kitab' (book) has no 'al-' and no tanween, while 'al-talib' is in the genitive case (ending in -i).

  2. مِفْتَاحُ سَيَّارَةٍ

    A car key

    Word by Word: Key (of) a car

    This is an indefinite Idafa. Because 'sayyara' (car) is indefinite, the key is also indefinite.

  3. بَابُ البَيْتِ كَبِيرٌ

    The door of the house is big.

    Word by Word: Door (of) the house big

    'Bab al-bayt' is the Idafa acting as the subject of the sentence.

  4. مُدِيرُ الشَّرِكَةِ فِي المَكْتَبِ

    The company manager is in the office.

    Word by Word: Manager (of) the company in the office

    The first noun 'mudir' takes its case (nominative -u) from its role as the subject, while 'al-sharika' is genitive.

Common Mistakes

  • Adding 'al-' to the first noun.

    الكِتَابُ الطَّالِبِ
    كِتَابُ الطَّالِبِ

    Learners often try to translate 'The book of the student' literally. In Arabic, the first noun in an Idafa must never have the definite article 'al-'.

  • Using tanween on the first noun.

    كِتَابٌ الطَّالِبِ
    كِتَابُ الطَّالِبِ

    The first noun cannot have tanween. It must have a single vowel (u, a, or i) depending on its case.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

Possession by Joining Two NounsLevel 1

Learn This First

To understand the Idafa (Possessive) construction, you must first be able to identify nouns and understand how the definite article (al-) and indefinite endings (tanween) function, as the Idafa specifically modifies these elements to show the relationship between two words.

Learn Next

Patterns that build on this one.

And 5 more in the full list.