Arabic Grammar: The Adjective Clause (Relative Clauses)

The Adjective Clause in Arabic (جُمْلَةُ الصِّفَةِ)

Mastering Relative Clauses and Describing Nouns with Full Sentences

1. Introduction: What is an Adjective Clause?

In English grammar, an adjective clause (also known as a relative clause) is a subordinate clause that modifies a noun or pronoun. Instead of using a single adjective word like "the tall man," we use an entire phrase or sentence to describe the noun: "the man who left the mosque."

In Arabic grammar, this concept is known as جُمْلَةُ الصِّفَةِ (Jumlat al-Sifah) or صِلَةُ الْمَوْصُولِ (Silat al-Mawsool) when connected via a relative pronoun. While single-word adjectives in Arabic must match their noun in four aspects (gender, number, case, and definiteness), full-sentence descriptions operate under a fundamental syntactic branching rule.

The golden rule of Arabic relative clauses depends entirely on whether the noun being described (the antecedent) is Definite (مَعْرِفَة) or Indefinite (نَكِرَة).

2. Describing Definite Nouns (Standard Relative Clause)

When the antecedent noun is definite—marked by the article Al- (الـ), a possessive construction (Idafa), or a proper name—Arabic requires an explicit connector: the relative pronoun الاسْمُ الْمَوْصُولُ (Al-Ism Al-Mawsool) such as Al-ladhī (اَلَّذِي) or Al-latī (اَلَّتِي).

Without this connector, the sentence becomes grammatically incomplete or breaks apart into two separate unlinked statements.

اَلرَّجُلُ الَّذِي خَرَجَ مِنَ الْمَسْجِدِ طَبِيبٌ.

(Al-rajulu alladhī kharaja minal-masjidi tabībun)
Translation: The man who left the mosque is a doctor.

Here, because اَلرَّجُلُ (The man) has Al-, the relative pronoun الَّذِي is required to bridge the noun to the descriptive verb phrase kharaja minal-masjid.

3. Describing Indefinite Nouns (Asyndetic Clause)

Here is where Arabic grammar differs significantly from English! When describing an indefinite noun (a noun with tanween, e.g., "A man" or "A book"), Arabic STRICTLY FORBIDS using relative pronouns like Alladhī or Allatī.

Instead, the descriptive clause is simply placed directly after the indefinite noun without any connecting word at all (known in linguistics as an asyndetic relative clause).

رَأَيْتُ رَجُلاً خَرَجَ مِنَ الْمَسْجِدِ.

(Ra'aitu rajulan kharaja minal-masjidi)
Translation: I saw a man [who] left the mosque.

Critical Error to Avoid: Saying رَأَيْتُ رَجُلاً الَّذِي خَرَجَ is grammatically incorrect in Arabic because Alladhī cannot attach to an indefinite noun like Rajulan.

4. The Relative Pronouns Spectrum for Definite Nouns

When working with definite nouns, choose the correct form of Ism Al-Mawsool based on number, gender, and rationality:

Grammatical Category	Arabic Form	Transliteration	English Equivalent
Singular Masculine	اَلَّذِي	Alladhī	Who / Which / That
Singular Feminine	اَلَّتِي	Allatī	Who / Which / That
Plural Non-Human (Broken Plurals)	اَلَّتِي	Allatī	Which / That (e.g., books)
Plural Masculine (Human)	اَلَّذِينَ	Alladhīna	Who (Human men/group)
Plural Feminine (Human)	اَللَّاتِي / اَللَّائِي	Allātī / Allā'ī	Who (Human women)

5. The Resumptive Pronoun Rule (الرَّاعِد / 'Ā'id)

When constructing an adjective clause where the antecedent is the object of the clause (rather than the subject doing the action), Arabic requires a attached pronoun that "returns" to the main noun. This pronoun is called the 'Ā'id (عَائِد).

• English Structure: "The book that I read [ ]" (The spot after read is left empty).
• Arabic Structure: "The book that I read it" → اَلْكِتَابُ الَّذِي قَرَأْتُهُ (Notice the attached suffix ـهُ).

This returning pronoun must match the antecedent in both gender and number:

• "The letter that I wrote [it]" → اَلرِّسَالَةُ الَّتِي كَتَبْتُهَا (Attached suffix ـهَا for feminine noun).

💡 Structural Comparison Summary

Noun Type	Formula	Arabic Example
Definite	Noun (Al-) + Relative Pronoun + Sentence	اَلْكِتَابُ الَّذِي قَرَأْتُهُ
Indefinite	Noun (Tanween) + Sentence	كِتَابٌ قَرَأْتُهُ

6. Interactive Practice Exercise

Question 1: How do you translate "The car which is new"? (Car = Sayyārah, feminine definite)

Answer: اَلسَّيَّارَةُ الَّتِي هِيَ جَدِيدَةٌ (As-sayyāratu allatī hiya jadīdatun)

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Question 2: How do you translate "A car that is new"? (Indefinite noun)

Answer: سَيَّارَةٌ جَدِيدَةٌ (Sayyāratun jadīdatun) — No relative pronoun used!

Modern Standard Arabic (MSA) Educational Guides.