In the Arabic language, nouns are declinable. It means that, they have مَرْفُوع , مَنْصُوب , مَجْرور cases with different forms. Some nouns are indeclinable. This means that they don’t change their form (Wherever you find them, they will be same) for مَرْفُوع , مَنْصُوب , مَجْرور cases . Those nouns are called in Arabic as مَبنِيٌ. All the demonstrative pronouns and relative pronouns are مَبنِيٌ.
Examples:
| Case | Mabni Example |
| مَرْفُوع | هَذَا |
| مَنْصُوب | هَذَا |
| مَجْرور | هَذَا |
| Case | Mabni Example |
| مَرْفُوع | الَّذِيْنَ |
| مَنْصُوب | الَّذِيْنَ |
| مَجْرور | الَّذِيْنَ |
Exercises
- State TRUE or FALSE: Read the verse Quran (18:6). The phrase بِهَذَا is جَار مَجْرُور , هَذا is مَجْرُور and مَبنِيٌ.
- State TRUE or FALSE: Read the verse Quran (18:24). The phrase مِنْ هَذا is جَار مَجْرُور , هَذا is مَجْرُور and مَبنِيٌ.
- State TRUE or FALSE: Read the verse Quran (18:54). The phrase فِي هَذا is not جَار مَجْرُور , هَذا is مَجْرُور and مَبنِيٌ.
Answers to Exercises
| Concept of Mabni (Seq # 35) | T, T, F |
Source for the above : From the notes Trying to understand the Arabic Language – by Mohammed Aijaz
Source for above : Book 1 – Grammar Book
Understand-Arabic.com 
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