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شاهدت صديقتي أحد الأفلام الوثائقية.

شاهدت صديقتي أحد الأفلام الوثائقية.shâhadat sadîqatî ahada al-aflâmi al-wathâ'iqiyyah
My female friend watched one of the documentary films.
From Lesson 289:One of the... (أحد / إحدى)·Arabic (Modern Standard)

Questions & Answers about شاهدت صديقتي أحد الأفلام الوثائقية.

Why do we use the masculine أحد when the subject watching the film is a female friend?
The word for "one of" agrees with the gender of the items in the group, not the person doing the action. Because the singular word for film (فيلم) is masculine, we use the masculine أحد. If she had watched one of the episodes (singular حلقة, which is feminine), we would use إحدى.
How does the phrase أحد الأفلام work as an Idafa (possession) construction?
In Arabic, "one of the [plural noun]" is built as an Idafa. The word أحد is the first part (the "possessed" word), so it never takes الـ. The plural noun الأفلام is the second part (the "possessor"), so it is definite and takes the genitive case (majruur).
Why is the adjective الوثائقية (documentary) in the feminine singular form?
It describes the noun الأفلام (the films). Since "films" is a non-human plural, Arabic grammar treats it as feminine singular. Therefore, any adjectives describing it must also be feminine singular.
What case ending does أحد have here, since it is part of an Idafa?
It takes an "a" sound (fatha) on the final letter, making it أحدَ. Even though it is the first word in an Idafa, its case is still determined by its role in the sentence. Here, it is the direct object of the verb شاهدت (watched), so it takes the accusative case (mansuub).

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