Endings That Cannot Be Written
In Arabic, most nouns show their case (nominative, accusative, genitive) through visible vowels like -u, -a, or -i. However, words ending in a long Alif, a long Ya, or those attached to the 'my' suffix (Ya al-Mutakallim) cannot physically carry these vowels. In these cases, the grammar is 'estimated' (taqdīrī) in the mind of the speaker even if it isn't written or heard.
How It Works
Arabic grammar identifies three primary linguistic reasons why a vowel is estimated rather than shown:
- Ta‘adhdhur (Impossibility): This occurs with الاسم المقصور (nouns ending in a fixed Alif), such as الفتى (the youth). It is physically impossible to place a short vowel on an Alif. Thus, the الضمة, الفتحة, and الكسرة are all estimated. If the noun is indefinite, like فتىً, it takes التنوين on the letter before the Alif, but the case remains estimated.
- Thiqal (Heaviness): This occurs with الاسم المنقوص (nouns ending in a fixed Yā’ preceded by a kasra), like القاضي, and with الفعل المعتل الناقص ending in Wāw or Yā’ (e.g., يدعو, يقضي). The nominative and genitive (for nouns) or nominative (for verbs) are estimated because they are heavy to pronounce, but the الفتحة is visible (القاضيَ, لن يقضيَ) because it is light. Note that for indefinite Manqūṣ nouns, the Yā’ is deleted in the nominative and genitive (e.g., قاضٍ).
- Inshighāl al-Maḥall (Occupied Place): This occurs when the spot for the case vowel is taken by a vowel required for another reason. This includes nouns attached to ياء المتكلم (my), where the letter must take a kasra to match the suffix. It also includes nouns preceded by 'extra' prepositions like من or بـ. Note that quoting full sentences is considered الإعراب المحلي rather than estimated.
Crucially, nouns ending in a Hamza preceded by an Alif (known as الاسم الممدود), such as سماء, are not estimated; they take visible vowels in all cases (سماءٌ, سماءً, سماءٍ).
For الفعل المعتل الناقص ending in Alif, the vowels are estimated in both the المرفوع and المنصوب (e.g., لن يسعى). However, in the المجزوم, the weak letter is deleted entirely (لم يسعَ) rather than being estimated.
Examples (4)
- جاءَ الفتى إلى المستشفى.
The youth came to the hospital.
Word by Word: Came the youth to the hospital.
Both 'al-fatā' (subject) and 'al-mustashfā' (after a preposition) have estimated endings because they end in Alif Maqṣūra.
- سألتُ القاضيَ عن القضيةِ.
I asked the judge about the case.
Word by Word: I-asked the-judge about the-case.
In the accusative case, the Manqūṣ noun (judge) shows the vowel because the fatḥa is light to pronounce.
- أخي يحبُّ وطني.
My brother loves my homeland.
Word by Word: My-brother he-loves my-homeland.
Both 'brother' and 'homeland' have estimated endings because the 'my' suffix (Ya) forces a kasra on the preceding letter.
- يدعو المؤمنُ ربَّه.
The believer calls upon his Lord.
Word by Word: Calls the-believer his-Lord.
The verb 'yad‘ū' (calls) has an estimated ḍamma (nominative) because it ends in a Waw, which makes the vowel 'heavy' to pronounce.
Common Mistakes
Assuming the accusative is always hidden for nouns ending in 'Ya'.
رأيتُ القاضِي.رأيتُ القاضيَ.For Manqus nouns like 'al-qadi', the fatha (accusative) is visible because it is not phonetically heavy. Only the damma and kasra are estimated.
Treating these words as 'fixed' (mabnī) in grammatical analysis.
الفتى كلمة مبنيةالفتى كلمة معربة بضمة مقدرةThese words are still declinable (mu'rab). If you are asked for the case, you must say it is 'nominative with an estimated damma,' not that it has no case.
Forgetting to drop the 'Ya' in indefinite Manqus nouns.
هذا قاضيٌ.هذا قاضٍ.When a Manqus noun is indefinite and in the nominative or genitive case, the final 'Ya' is deleted and replaced with tanwin al-kasr. The case ending is still considered 'estimated' on the deleted letter.
How It Connects
Learn This First
Estimated Inflection (Al-I'rab al-Taqdiri) occurs when a word's ending prevents the physical appearance of case marks (Dhamma, Fatha, Kasra). To understand this, you must first be familiar with the standard system of Arabic case endings, the nature of long vowels (which cause the 'blockage'), and how short vowels normally function as grammatical markers.
- The Case and Mood Endings
Learners must first understand the general concept of case and mood endings (I'rab) before learning about cases where those endings are hidden or estimated.
Foundations - Long Vowels
This pattern specifically deals with words ending in long vowels (Alif, Waw, Ya) which prevent the short vowel case marks from appearing.
Foundations - Short Vowel Marks
Since estimated I'rab involves the 'theoretical' presence of short vowels that cannot be written, a firm grasp of standard vowel marks is essential.
Foundations
Related Patterns
- Nouns Ending in Weak Letters
Maqṣūr and Manqūṣ nouns are the primary categories that trigger estimated inflection, unlike Mamdūd nouns which show visible endings.
Level 6 - Possessive Endings on Nouns
The 'my' suffix is a primary cause for hiding case vowels on regular nouns.
Level 1 - Case for Things That Cannot Change
Often confused with estimated inflection, this applies to words that are truly 'frozen' (mabnī).
Level 5 - Verbs Ending in a Weak Letter
Verbs ending in weak letters also use estimated inflection in the present tense.
Level 3
Learn Next
Patterns that build on this one.
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