ـِينَ • (-īna) m
- Oblique-case suffix—i.e. accusative-case (manṣūb) and genitive-case (majrūr)—used to pluralize masculine nouns and adjectives referring to people. In Classical Arabic, with full ʾiʿrāb, appears as ـِينَ (-īna). Note that most masculine nouns and adjectives referring to people, especially shorter ones, are not pluralized in this fashion, but use a broken plural instead. Furthermore, non-human masculine nouns don't use this suffix, either forming a broken plural or using the "feminine" suffix ـَات (-āt).
- Oblique-case suffix used very occasionally to pluralize non-human nouns, including some that are feminine, such as سَنَة (sana, “year”), accusative and genitive plural سِنِين (sinīn).
- ـُونَ (-ūna) (for the nominative case)
ـَيْنِ • (-ayni) m
- Dual oblique suffix in Modern Standard Arabic. In Classical Arabic, with full ʾiʿrāb, appears as ـَيْنِ (-ayni). The corresponding construct form is ـَيْ (-ay).
- Dual suffix in informal Arabic. The corresponding construct form is ـَيْ (-ay).
- ـَانِ (-āni) (for the nominative case)