To express "one of the..." in Arabic, use an Idafa (possessive) construction. The first word is the number "one," followed by a definite plural noun.
Always match the gender of "one" to the singular form of the noun:
- Use the masculine أحد for masculine nouns (like فيلم "film" or كائن "creature").
- Use the feminine إحدى for feminine nouns (like فصيلة "species" or سلحفاة "turtle").
Because this is an Idafa, the plural noun takes the genitive case. Any adjectives describing it follow the noun and match its definiteness and case as usual.
The Masculine (أحد)
| My female friend watched one of the documentary films. | شاهدت صديقتي أحد الأفلام الوثائقية.shâhadat sadîqatî ahada al-aflâmi al-wathâ'iqiyyah |
| This wild animal is one of the threatened creatures. | هذا الحيوان البري أحد الكائنات المهددة.hâdhâ al-hayawânu al-barriyyu ahadu al-kâ'inâti al-muhaddadah. |
| The fire ruined one of the natural habitats. | خربت النار أحد المواطن الطبيعية.kharrabati an-nâru ahada al-mawâtini at-tabî'iyyah |
The Feminine (إحدى)
Unlike أحد, which changes its ending to reflect case, إحدى ends in an alif maqsurah and does not visibly change.
| One of the unique species lives in this forest. | تعيش إحدى الفصائل الفريدة في هذه الغابة.ta'eeshu ihda l-fasâ'ili l-farîdati fî hâdhihi l-ghâbati |
| One of the turtles is threatened with extinction. | إحدى السلاحف مهددة بالانقراض.ihdâ as-salâhifi muhaddadatun bil-inqirâdi |
| The lion almost caught one of the turtles. | كاد الأسد يمسك بإحدى السلاحف.kâda al-asadu yumsiku bi-ihdâ as-salâhifi |
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