The complete source chapter: case markers, stem changes, nūn deletion, exceptions and parsing Read the bilingual lesson for The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah and test your understanding with a focused quiz.
Lesson
1. Chapter: The Dual Noun
الْمُثَنَّى
Translation: a noun referring to two persons or things.
Rajulun means one man; rajulāni means two men.
This chapter covers case endings, unusual base forms, and annexation.
2. The Core Meaning of the Dual
رَجُلٌ ← رَجُلَانِ
Translation: one man becomes two men.
A regular dual is built from a singular to denote two of the same named kind.
Merely referring to two is not sufficient to identify a regular dual form.
3. Dual Signs Across Three Cases
رَجُلَانِ — رَجُلَيْنِ
The dual takes -āni in the nominative and -ayni in both accusative and genitive.
There are three cases but two visible ending patterns.
4. The Alif Marks Nominative
جَاءَ رَجُلَانِ.
Translation: two men came.
Rajulāni is a nominative subject; its alif marks nominative. The nūn is not the case marker.
5. The Yāʾ Marks Accusative
رَأَيْتُ رَجُلَيْنِ.
Translation: I saw two men.
Rajulayni is a direct object in the accusative; yāʾ marks the case.
6. The Same Yāʾ Marks Genitive
مَرَرْتُ بِرَجُلَيْنِ.
Translation: I passed by two men.
The preposition bi makes rajulayni genitive. The form matches the accusative, but the grammatical cause differs.
7. Dual Is Declined, Not Frozen
الطَّالِبَانِ — الطَّالِبَيْنِ
The dual is declinable. Different governors require nominative alif or accusative/genitive yāʾ.
8. Dual versus Sound Masculine Plural
مُسْلِمَيْنِ — مُسْلِمِينَ
Muslimayni is dual, with fatḥah before yāʾ and kasrah on nūn.
Muslimīna is sound masculine plural, with kasrah before yāʾ and fatḥah on nūn.
9. Regular Feminine Dual
طَالِبَةٌ ← طَالِبَتَانِ / طَالِبَتَيْنِ
A regular feminine noun ending in tāʾ marbūṭah shows t before the dual ending: ṭālibatāni / ṭālibatayni.
The source later mentions two special words.
10. A Full Example with Books
هَذَانِ كِتَابَانِ.
These are two books.
Hādhāni is a nominative dual demonstrative; kitābāni is the nominative predicate of the nominal sentence.
11. When a Dual Subject Follows a Verb
جَاءَ الطَّالِبَانِ.
Two students came.
In standard verb–subject order, a verb normally remains singular before an explicit dual subject: jāʾa al-ṭālibāni.
12. Dual Subject and Predicate
الطَّالِبَانِ مُجْتَهِدَانِ.
The two students are diligent.
The dual nominative subject (mubtadaʾ) and dual nominative predicate both end in -āni.
13. Duality Does Not Change Gender
الطَّالِبَتَانِ مُجْتَهِدَتَانِ.
Both female students are diligent.
Subject and predicate agree in feminine gender and dual number.
14. Why Fatḥah Before Dual Yāʾ
رَجُلَيْنِ ≠ مُسْلِمِينَ
Dual has fatḥah before yāʾ; sound masculine plural has kasrah before yāʾ.
The preceding vowel helps distinguish the two forms.
15. Dualizing a Maqṣūr Noun
عَصًا — فَتًى
The maqṣūr noun ends in a fixed alif. To make a dual one must account for the original nature and length of the word, not merely append -āni.
16. Maqṣūr with Original Wāw
عَصًا ← عَصَوَانِ
ʿAṣan (staff) has a final alif originating from wāw in a three-letter word.
Its dual restores wāw: ʿaṣawāni nominative, ʿaṣawayni accusative/genitive.
17. Maqṣūr with Original Yāʾ
فَتًى ← فَتَيَانِ
Fatā (youth) has final alif from yāʾ.
Its dual has yāʾ: fatayāni nominative; fatayayni accusative/genitive. Contrast ʿaṣawāni.
18. Longer Maqṣūr Forms
مَلْهًى ← مَلْهَيَانِ
A maqṣūr noun longer than three letters generally turns its final alif into yāʾ before the dual ending.
Malhā (recreation place): malhayāni; malhayayni.
19. Three Decisions for Maqṣūr
Three-letter maqṣūr from wāw restores wāw; three-letter from yāʾ uses yāʾ; longer maqṣūr generally uses yāʾ.
The written final alif alone cannot establish its origin.
20. What Is a Mamdūd Noun?
قَرَّاءٌ — حَمْرَاءُ — كِسَاءٌ
A mamdūd noun ends in alif followed by hamzah.
Dual formation depends on whether hamzah is original, marks femininity, or replaces an original weak letter.
21. Original Hamzah Remains
قَرَّاءٌ ← قَرَّاءَانِ
Qarrāʾ (an avid reader) contains a root hamzah.
It is kept in the dual: qarrāʾāni (nom.) and qarrāʾayni (acc./gen.).
22. Feminine Hamzah Becomes Wāw
حَمْرَاءُ ← حَمْرَاوَانِ
The feminine final hamzah in ḥamrāʾ becomes wāw before dual endings: ḥamrāwāni / ḥamrāwayni.
23. Hamzah Substituted for Wāw or Yāʾ
كِسَاءٌ ← كِسَاءَانِ / كِسَاوَانِ
Kisāʾ has a final hamzah substituted for original wāw.
Both kisāʾāni and kisāwāni are admitted for this class. Do not generalize the option to every hamzah.
24. Another Substituted Hamzah
رِدَاءٌ ← رِدَاءَانِ / رِدَاوَانِ
Ridāʾ has hamzah substituted for original yāʾ.
The source permits ridāʾāni and ridāwāni in the dual.
25. Three Hamzah Conditions
Original hamzah stays; feminine hamzah becomes wāw; hamzah substituting for wāw/yāʾ permits both retaining hamzah and replacing it with wāw.
26. Dual Nūn Drops in Iḍāfah
جَاءَ غُلَامَا زَيْدٍ.
The two servants of Zayd came.
The dual loses its nūn when it becomes the first term of iḍāfah: ghulāmā Zaydin, not ghulāmāni Zaydin.
27. Accusative Dual in Iḍāfah
رَأَيْتُ غُلَامَيْ زَيْدٍ.
I saw Zayd’s two servants.
Ghulāmay is accusative with yāʾ and lacks the dual nūn because it is a muḍāf.
28. Genitive Dual in Iḍāfah
مَرَرْتُ بِغُلَامَيْ زَيْدٍ.
I passed by Zayd’s two servants.
Bi governs genitive, while iḍāfah—not the preposition—accounts for loss of the dual nūn.
29. Dual Annexed to a Pronoun
كِتَابَاهُ — كِتَابَيْهِ
His two books: kitābāhu (nominative) and kitābayhi (accusative/genitive).
Both lose the nūn before the genitive attached pronoun.
30. Dropped Nūn Does Not Mean Singular
غُلَامَانِ — غُلَامَا زَيْدٍ
Both expressions refer to two servants.
In the second, nūn is deleted because of iḍāfah, not because the noun ceased to be dual.
31. The Regular Tāʾ Rule
طَالِبَةٌ ← طَالِبَتَانِ
Regular feminine tāʾ remains as t before the dual ending (ṭālibatāni).
The text then notes two exceptional anatomical nouns.
32. Two Special Forms in the Text
خُصْيَةٌ ← خُصْيَانِ
أَلْيَةٌ ← أَلْيَانِ
The text notes special duals khuṣyāni (testicles) and alyāni (the two buttocks), where the feminine tāʾ disappears.
Do not extend this special treatment to all nouns ending in ة.
33. Why the Text Mentions These Exceptions
The source connects these exceptional forms with organs occurring in an associated pair.
This is a source-specific explanation, not a general license to drop feminine tāʾ from every paired body part.
34. Plural Form with Two Owners
أَيْدِيَهُمَا
Aydīhimā means their hands (of the two).
The possessed term is plural while the pronoun refers to two people; the source discusses this pattern of related parts.
35. The Source’s Qurʾānic Example
فَاقْطَعُوا أَيْدِيَهُمَا
An excerpt of Qurʾān 5:38; here it is cited solely to illustrate plural aydī (hands) annexed to the dual pronoun humā.
Aydiya is the accusative direct object and muḍāf. This slide does not address legal interpretation.
36. Parsing an Iḍāfah with a Dual
حَضَرَ مُعَلِّمَا الْمَدْرَسَةِ.
The two teachers of the school arrived.
Muʿallimā is a nominative dual subject in iḍāfah with its nūn omitted; al-madrasati is genitive.
37. Nominative and Accusative Together
رَأَى الْمُعَلِّمَانِ طَالِبَيْنِ.
Two teachers saw two students.
Al-muʿallimāni is the nominative dual subject; ṭālibayni is the accusative dual object.
38. Three Common Errors
Correct three common errors: nominative after a transitive verb, failure to drop nūn in iḍāfah, and failure to change feminine mamdūd hamzah into wāw.
39. Final Comparison of Three Stem Types
رَجُلٌ ← رَجُلَانِ
عَصًا ← عَصَوَانِ
حَمْرَاءُ ← حَمْرَاوَانِ
Sound noun takes ordinary dual markers. Maqṣūr requires attention to the final alif’s origin; mamdūd depends on the type of final hamzah. All three remain dual.
40. Summary and Next Chapter
Nominative dual is marked by alif; accusative/genitive by yāʾ. The dual nūn is kasrah-marked and lost in annexation.
Maqṣūr and mamdūd forms follow separate stem rules. The text also covers two lexical exceptions and plural possessed forms with dual owners.
Next: plurals.
Practice questions
Question 1
In jāʾa rajulāni, what is the noun’s case?
- Nominative
- Accusative
- Genitive
- Jussive
Question 2
Which correctly says “I saw two men”?
- Raʾaytu rajulāni
- Raʾaytu rajulayni
- Raʾaytu rajulun
- Raʾaytu rijālun
Question 3
Why is al-ṭālibayni genitive?
- Presence of nūn
- Being dual itself
- The preposition bi-
- Past tense
Question 4
What marks nominative dual?
Question 5
What distinguishes muslimayni and muslimīna?
- First dual, second sound masculine plural
- Both dual
- Both sound plurals
- First verb, second noun
Question 6
Nominative dual of ṭālibah?
- Ṭālibatayni
- Ṭālibatāni
- Ṭālibāni
- Ṭālibātun
Question 7
Why is jāʾa singular before al-ṭālibāni?
- The subject is singular
- Al-ṭālibāni is an object
- The verb precedes its explicit subject
- Dual cannot be a subject
Question 8
Role of mujtahidāni?
- Accusative object
- Genitive annex
- Preposition
- Nominative dual predicate
Question 9
Nominative dual of ʿaṣā?
- ʿAṣawāni
- ʿAṣayāni
- ʿAṣāni
- ʿAṣawayni
Question 10
Where can ʿaṣawayni occur?
- Only nominative
- Accusative and genitive
- Only jussive
- Nominative and jussive
Question 11
Nominative dual of fatā?
- Fatawāni
- Fatāni with tanwīn
- Fatayāni
- Fatayayni
Question 12
What is fatayayni used for?
- Only nominative
- Sound feminine plural
- Indeclinable demonstrative
- Accusative or genitive
Question 13
Nominative dual of malhā?
- Malhayāni
- Malhawāni
- Malhayayni
- Malhāni
Question 14
Key first question when dualizing maqṣūr?
- Only whether it is definite
- Origin of final alif and word length
- Only first letter
- Only whether it bears tanwīn
Question 15
Nominative dual of qarrāʾ with original hamzah?
- Qarrāwāni
- Qarrāʾayni
- Qarrāʾāni
- Qarrāni
Question 16
Nominative dual of ḥamrāʾ?
- Ḥamrāʾāni
- Ḥamrāwayni
- Ḥamrāni
- Ḥamrāwāni
Question 17
Which cases allow ḥamrāwayni?
- Accusative or genitive
- Only nominative
- Only jussive
- Nominative and genitive only
Question 18
Which two dual forms of kisāʾ does the source permit?
- Kisāʾāni and kisayāni
- Kisāʾāni and kisāwāni
- Kisāwāni and kisuwāni
- Only kisāni
Question 19
What choice applies to ridāʾ dual?
- Always delete hamzah
- Always insert yāʾ
- Keep hamzah or replace with wāw
- Always drop nūn without annexation
Question 20
What happens to feminine hamzah in mamdūd dual?
- Always remains hamzah
- Becomes tanwīn
- Always becomes yāʾ
- It changes to wāw
Question 21
Why is dual nūn missing in ghulāmā Zaydin?
- Because of iḍāfah
- Because of nominative case
- Because of past tense
- Because dual meaning was negated
Question 22
Parse ghulāmay in raʾaytu ghulāmay Zaydin.
- Nominative subject by alif
- Accusative object by yāʾ, muḍāf
- Genitive annex
- Nominative predicate by ḍamma
Question 23
What causes nūn deletion in bi-ghulāmay Zaydin?
- The preposition
- Accusative dual
- Iḍāfah
- Feminine subject
Question 24
What case does kitābāhu show?
- Accusative
- Genitive
- Jussive
- Nominative
Question 25
What cases can kitābayhi represent?
- Accusative and genitive
- Only nominative
- Only jussive
- Nominative and accusative
Question 26
Correct iḍāfah form of ghulāmāni Zaydin?
- Ghulāmāni Zaydin
- Ghulāmā Zaydin
- Ghulāmayni Zaydun
- Ghulāmāni Zaydun
Question 27
What special dual of khuṣyah is given?
- Khuṣyatāni
- Khuṣayni
- Khuṣyāni
- Khuṣyūna
Question 28
Special dual of alyah in the source?
- Alyatāni
- Alyūna
- Alyātun
- Alyāni
Question 29
What number is aydī in aydīhimā?
- Plural
- Dual
- Singular
- Number noun
Question 30
Whom does humā indicate?
- One speaker
- Two persons or referents
- Three people
- Indefinite feminine plural
Question 31
Function of muʿallimā in ḥaḍara muʿallimā al-madrasati?
- Accusative dual object
- Genitive annex
- Nominative dual subject
- Accusative circumstantial
Question 32
Object in raʾā al-muʿallimāni ṭālibayni?
- Al-muʿallimāni
- Raʾā
- The dual alif
- Ṭālibayni
Question 33
Why do qarrāʾāni and ḥamrāwāni differ?
- Original vs feminine hamzah
- Accusative vs genitive
- Verb vs noun
- Plural vs singular
Question 34
When must a dual’s nūn be omitted?
- Whenever dual is subject
- When dual is muḍāf
- Whenever dual is definite
- Whenever it has alif
Question 35
Difference between al-muʿallimāni and muʿallimā al-madrasati?
- Second is singular
- First is accusative
- Second is muḍāf; its nūn is lost
- Both are verbs
Question 36
How do the regular and exceptional feminine duals differ?
- All feminine tāʾ is lost
- Ṭālibah only forms plural
- Khuṣyah always loses nūn
- Ṭālibah keeps tāʾ; special khuṣyah drops it
Question 37
Example of plural possessed noun with a dual possessor?
Question 38
Rajulayni is used only in the accusative.
Question 39
A normal dual nūn bears kasrah.
Question 40
ʿAṣawāni restores wāw because ʿaṣā originally ended in wāw.
Question 41
Every maqṣūr dual necessarily has wāw.
Question 42
Feminine hamzah of ḥamrāʾ turns to wāw in the dual.
Question 43
Iḍāfah always deletes the dual alif or yāʾ.
Question 44
Kitābayhi loses its dual nūn because it is annexed to a pronoun.
Question 45
The text gives khuṣyāni as a special dual of khuṣyah.
Question 46
Both aydī and humā are dual in aydīhimā.
Question 47
Jāʾa can be singular before the explicit dual subject al-ṭālibāni.
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