Printed pages 18–19: wāw, alif and yāʾ case signs, four conditions and full grammatical parsing. Read the bilingual lesson for Noun Case Classes: Type 4 — The Six Nouns and test your understanding with a focused quiz.
Lesson
1. Fourth Declension Class: The Six Nouns
الرَّابِعُ: أَنْ يَكُونَ الرَّفْعُ بِالْوَاوِ، وَالنَّصْبُ بِالْأَلِفِ، وَالْجَرُّ بِالْيَاءِ، وَيَخْتَصُّ بِالْأَسْمَاءِ السِّتَّةِ مُكَبَّرَةً مُوَحَّدَةً مُضَافَةً إِلَى غَيْرِ يَاءِ الْمُتَكَلِّمِ.
Translation: In the fourth class, the nominative is marked by wāw, the accusative by alif, and the genitive by yāʾ. This applies to the six special nouns when four conditions are met.
Key idea: Earlier classes usually showed vowel case endings; here a letter functions as the case sign. The rule is limited to specific nouns and conditions.
2. The Book’s List of Six Nouns
وَهِيَ أَخُوكَ وَأَبُوكَ وَحَمُوكَ وَهَنُوكَ وَفُوكَ وَذُو مَالٍ.
Translation: They are: your brother, your father, your male in-law, the word han, your mouth, and a person possessing wealth.
أَخٌ: brother; أَبٌ: father; حَمٌ: a male relation by marriage, especially through one's spouse.
هَنٌ: a classical euphemistic noun used for a thing or a private body part in context.
فُو: mouth; ذُو: possessor of / one having.
The suffix كَ means “your”; in «ذُو مَالٍ», the meaning is “possessor of wealth”.
3. The Book’s Original Example
تَقُولُ: «جَاءَنِي أَخُوكَ، وَرَأَيْتُ أَخَاكَ، وَمَرَرْتُ بِأَخِيكَ»، وَكَذَا الْبَوَاقِي.
Translation: You say: “Your brother came to me; I saw your brother; and I passed by your brother.” The remaining nouns follow the same pattern.
أَخُوكَ uses wāw, أَخَاكَ uses alif, and أَخِيكَ uses yāʾ as case signs. The final pronoun كَ is unchanged.
4. Letter-Based Case Marking
The basic three-case pattern:
Nominative — wāw: أَخُوكَ
Accusative — alif: أَخَاكَ
Genitive — yāʾ: أَخِيكَ
First identify the word's syntactic function, then its case sign. Seeing wāw, alif or yāʾ in another word does not automatically make it one of the six nouns; the four conditions must also hold.
5. Full Parsing: Nominative
جَاءَنِي أَخُوكَ.
Translation: Your brother came to me.
جَاءَ: past-tense verb, built on fatḥa.
نِ: protective nūn; ي: attached pronoun functioning as the direct object.
أَخُو: subject (fāʿil), nominative with wāw as its sign; also the first term of iḍāfa.
كَ: attached indeclinable pronoun, in the genitive position as the second term of iḍāfa.
Why wāw? Because the word is nominative and meets the conditions of the six-noun rule.
6. Full Parsing: Accusative
رَأَيْتُ أَخَاكَ.
Translation: I saw your brother.
رَأَيْتُ: past-tense verb; its تُ is the subject pronoun.
أَخَا: direct object, accusative with alif as its sign, and the first term of iḍāfa.
كَ: attached pronoun in the genitive position as the second term of iḍāfa.
Contrast: The brother is now the person seen, not the doer, so the case sign is alif, not wāw.
7. Full Parsing: Genitive
مَرَرْتُ بِأَخِيكَ.
Translation: I passed by your brother.
مَرَرْتُ: past-tense verb with the subject pronoun تُ.
بِ: preposition.
أَخِي: genitive noun with yāʾ as the genitive case sign; also the first term of iḍāfa.
كَ: attached pronoun, second term of iḍāfa, in the genitive position.
Key point: The preposition بِ causes genitive case; the sign on this particular noun is yāʾ, not a kasra ending.
8. All Six Nouns: Case Forms
Nominative ← accusative ← genitive
أَبٌ: أَبُوكَ ← أَبَاكَ ← أَبِيكَ
أَخٌ: أَخُوكَ ← أَخَاكَ ← أَخِيكَ
حَمٌ: حَمُوكَ ← حَمَاكَ ← حَمِيكَ
هَنٌ: هَنُوكَ ← هَنَاكَ ← هَنِيكَ (specialized classical use)
فُو: فُوكَ ← فَاكَ ← فِيكَ
ذُو: ذُو مَالٍ ← ذَا مَالٍ ← ذِي مَالٍ
These are instructional forms: the conditions must be met for this pattern. The noun هَن also has other attested inflectional usages in classical Arabic.
9. Condition 1: Not Diminutive
مُكَبَّرَةً means the noun must be in its regular, non-diminutive form.
أَخُوكَ: the ordinary “your brother” form; the condition is met.
أُخَيُّكَ: a diminutive, “your little brother,” which uses ordinary vowel endings.
جَاءَ أُخَيُّكَ، رَأَيْتُ أُخَيَّكَ، مَرَرْتُ بِأُخَيِّكَ.
Translation: Your little brother came; I saw your little brother; I passed by your little brother.
The special wāw/alif/yāʾ pattern no longer applies to this diminutive.
10. Condition 2: Singular
مُوَحَّدَةً means the noun must be singular, not dual or plural.
أَبُوكَ: your father; singular, so this condition is satisfied.
أَبَوَاكَ: your two parents; dual, following its own case rules.
آبَاءٌ: fathers; plural, not the singular six-noun pattern.
The meaning “father” or “brother” is insufficient: examine the word form as well.
11. Condition 3: In Iḍāfa
مُضَافَةً means the noun must be the first term of a possessive/construct phrase (iḍāfa).
جَاءَ أَبُوكَ.
Translation: Your father came. Here «أَبُو» is the first term and «كَ» is the second, so the special pattern can apply.
جَاءَ أَبٌ، رَأَيْتُ أَبًا، مَرَرْتُ بِأَبٍ.
Translation: A father came; I saw a father; I passed by a father.
Without iḍāfa, «أَبٌ» declines like an ordinary noun with ḍamma, fatḥa and kasra.
12. Condition 4: Not Added to First-Person Yāʾ
إِلَى غَيْرِ يَاءِ الْمُتَكَلِّمِ: the noun must not be in iḍāfa to the first-person possessive yāʾ (“my”).
أَبُوكَ، أَبَاكَ، أَبِيكَ: “your father,” where كَ allows the letter-based case signs to appear.
جَاءَ أَبِي، رَأَيْتُ أَبِي، مَرَرْتُ بِأَبِي.
Translation: My father came; I saw my father; I passed by my father.
The syntactic cases still differ, but with «أَبِي» the case endings are estimated/implicit; the yāʾ is not simply a genitive sign in every instance.
13. All Four Conditions Together
When do the six nouns take letter-based case signs?
1. Non-diminutive form.
2. Singular form.
3. Occurring as the first term of iḍāfa.
4. Added to something other than first-person possessive yāʾ.
In جَاءَ أَخُوكَ, all four conditions are present; therefore «أَخُو» is nominative with wāw.
Judge the word in its construction, not in isolation.
14. Identify Both Parts of Iḍāfa
أَبُوكَ — أَخَاكَ — أَخِيكَ
Translation: Your father; your brother (as object); your brother (in a genitive context).
Here أَبُو / أَخَا / أَخِي are each the first term of iḍāfa, and «كَ» is the second term every time.
Key distinction: «كَ» is always in a genitive position, but the first term can be nominative, accusative, or genitive depending on its role in the full sentence.
The genitive status of the second term does not force the first term into a single case.
15. Father: Three Case Examples
جَاءَ أَبُوكَ.
Translation: Your father came. «أَبُو» is the nominative subject marked by wāw.
أَكْرَمْتُ أَبَاكَ.
Translation: I honoured your father. «أَبَا» is the accusative object marked by alif.
سَلَّمْتُ عَلَى أَبِيكَ.
Translation: I greeted your father. «أَبِي» is genitive after عَلَى, marked by yāʾ.
These are additional teaching examples; the book's main illustrated example uses «أَخُوكَ».
16. Classical Nouns: Ḥam and Han
حَمُوكَ: your male in-law.
جَاءَ حَمُوكَ، رَأَيْتُ حَمَاكَ، سَلَّمْتُ عَلَى حَمِيكَ.
Translation: Your male in-law came; I saw him; I greeted him.
هَنٌ is a classical euphemistic noun for a thing or a private part, depending on context. The textbook includes هَنُوكَ among the six.
هَنُوكَ — هَنَاكَ — هَنِيكَ
These illustrate the book's special inflectional pattern; other historical inflectional usages are also attested for this noun.
Note: The goal here is to learn the grammar, not to prioritize these uncommon words for everyday speech.
17. Fū: The Noun for Mouth
فُوكَ — فَاكَ — فِيكَ
Translation: your mouth, in the three cases.
فُوكَ مُغْلَقٌ.
Translation: Your mouth is closed. «فُو» is the nominative subject/topic marked by wāw.
فَتَحْتَ فَاكَ.
Translation: You opened your mouth. «فَا» is the accusative object marked by alif.
نَظَرْتُ إِلَى فِيكَ.
Translation: I looked at your mouth. «فِي» is genitive, marked by yāʾ.
Additional clarification: This special form is فُو without mīm. When «فَمٌ» retains mīm, it normally declines «فَمٌ، فَمًا، فَمٍ».
18. Dhū Mālin: Possessor of Wealth
ذُو مَالٍ — ذَا مَالٍ — ذِي مَالٍ
Translation: a person possessing wealth, in three grammatical cases.
جَاءَ ذُو مَالٍ.
Translation: A wealthy person came. «ذُو» is the nominative subject marked by wāw.
رَأَيْتُ ذَا مَالٍ.
Translation: I saw a wealthy person. «ذَا» is the accusative object marked by alif.
مَرَرْتُ بِذِي مَالٍ.
Translation: I passed by a wealthy person. «ذِي» is genitive, marked by yāʾ.
In all three, «مَالٍ» is the genitive second term of iḍāfa. Here «ذُو» means possessor, not the demonstrative «ذَا».
19. A Crucial Distinction with Dhū
جَاءَ ذُو عِلْمٍ.
Translation: A person of knowledge came.
ذُو: nominative subject marked by wāw, the first term of iḍāfa; عِلْمٍ: genitive second term.
هٰذَا كِتَابٌ.
Translation: This is a book. Here «هٰذَا» is a demonstrative.
Avoid confusion: «ذَا» may be the accusative form of ذُو, meaning “possessor of”; do not classify every occurrence of «ذا» as the same grammatical item.
20. Compare Six-Noun and Ordinary Declension
Ordinary noun: زَيْد
جَاءَ زَيْدٌ — رَأَيْتُ زَيْدًا — مَرَرْتُ بِزَيْدٍ.
Translation: Zayd came; I saw Zayd; I passed by Zayd.
One of the six nouns: أَخ
جَاءَ أَخُوكَ — رَأَيْتُ أَخَاكَ — مَرَرْتُ بِأَخِيكَ.
Translation: Your brother came; I saw your brother; I passed by your brother.
The ordinary noun زَيْد shows vowel case signs, while this special construct form of «أَخ» uses letters as signs.
21. Case Depends on Syntactic Role
حَضَرَ أَخُوكَ، وَأَكْرَمْتُ أَخَاكَ.
Translation: Your brother arrived, and I honoured your brother.
In the first clause, أَخُو is a nominative subject with wāw. In the second, أَخَا is an accusative direct object with alif.
تَحَدَّثْتُ إِلَى أَخِيكَ.
Translation: I spoke to your brother. «إِلَى» is a preposition, so «أَخِي» is genitive with yāʾ.
Practice principle: Identify the syntactic role first; then name the case sign.
22. Implicit Case Endings with Abī
جَاءَ أَبِي — رَأَيْتُ أَبِي — سَلَّمْتُ عَلَى أَبِي.
Translation: My father came; I saw my father; I greeted my father.
«أَبِي» functions as a subject, then an object, then a genitive noun across the three sentences.
Why the identical form? It is attached to first-person possessive yāʾ, so case is implicit/estimated rather than overtly marked in the regular six-noun pattern.
The ي in «أَبِي» is not the genitive case sign in every sentence; it is the possessive pronoun meaning “my”.
23. Check the Four Conditions in Practice
Inspect the word: أَخَاكَ
Non-diminutive? Yes.
Singular? Yes.
In iḍāfa? Yes, to «كَ».
Not added to my-yāʾ? Yes, it is «كَ», not «ي».
All four conditions are met. Thus «أَخَا» is accusative with alif when its role in the sentence calls for accusative case.
Correct sequence: noun type → four conditions → governor and role → case sign.
24. Avoid Incorrect Analogies
Misconception 1: «أَبٌ» is always nominative with wāw.
Correct: Without iḍāfa, «أَبٌ» takes ordinary vowel case signs.
Misconception 2: The yāʾ in «أَبِي» must always indicate genitive.
Correct: It is the first-person possessive pronoun and occurs with different syntactic cases.
Misconception 3: Every «ذَا» must be a demonstrative.
Correct: In «ذَا مَالٍ», it is the accusative of ذُو.
Misconception 4: A genitive second term forces the first term to be genitive.
Correct: The first term's case depends on its own syntactic role.
25. Summary and Short Practice
Today's rule: Provided four conditions are met, the six special nouns take wāw in nominative, alif in accusative and yāʾ in genitive.
Complete these:
1. جَاءَ ... — أَخُوكَ / أَخَاكَ / أَخِيكَ
2. رَأَيْتُ ... — أَخُوكَ / أَخَاكَ / أَخِيكَ
3. مَرَرْتُ بِـ... — أَخُوكَ / أَخَاكَ / أَخِيكَ
Check: 1. أَخُوكَ (subject); 2. أَخَاكَ (object); 3. أَخِيكَ (genitive).
The next lesson will treat the textbook's fifth class, dual nouns.