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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)

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### The Feminine (إحدى)

Unlike أحد, which changes its ending to reflect case, إحدى ends in an *alif maqsurah* and does not visibly change.

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One of the... (أحد / إحدى)

adjective

adverb

conjunction

determiner

interjection

interrogative

noun

numeral

particle

prefix

preposition

pronoun

sentence

verb

The definite article and locatives (الـ)

Basic noun gender (ة)

Sun and moon letters

Singular subject pronouns (أنا، أنت، هو، هي)

Indefinite nouns and nominal sentences (ـٌ)

Demonstrative pronouns for 'this' (هذا / هذه)

Separate prepositions (في، من، إلى، على)

Attributive adjectives

Predicative adjectives

Yes/No questions (هل، أ)

Basic questions (من، ما، أين)

Singular possessive pronouns (ـي، ـك، ـه، ـها)

Plural subject pronouns (نحن، أنتم، هم)

Plural possessive pronouns (ـنا، ـكم، ـهم)

Noun possession

Attached prepositions (بـ، لـ، كـ)

Pronouns with prepositions

Having and possessing (عند، لـ، مع)

Regular plural nouns (ـون، ـين، ـات)

Broken plurals

Dual nouns (ـان / ـين)

Plural and distant demonstratives (هؤلاء، ذلك، تلك)

Non-human plural agreement

Present tense singular verbs

Verbal sentences (VSO)

Present tense plural verbs

Topicalized sentences (SVO)

The indefinite accusative case (ـاً)

Verb object pronouns (-ني، -ك، -ه)

Present tense negation (لا)

Question words with verbs (متى، كيف...)

Adverbs of time and place

The future tense (سـ / سوف)

Intentions and desires (أن)

Negating states and possession (ليس)

Past tense singular suffixes

Past tense plural suffixes

Negating past events (ما)

Singular commands

Numbers 1 to 10

Number agreement for 1 and 2 (واحد، اثنان)

Asking how many (كم)

Numbers 3 to 10 (ثلاثة إلى عشرة)

Ordinal numbers 1 to 10 (الأول، الثاني)

Basic conjunctions (فـ، أو، لكن)

Ordering at a café (واحد، اثنان)

Food and drink with conjunctions (و، ف، أو، لكن)

There is and there are (هناك / ليس هناك)

Direct address (يا)

Giving reasons (لأنّ)

Relative pronouns (الذي / التي)

Quantifiers (كل / بعض)

The past tense of 'to be' (كان)

Past possession

Numbers 11 to 19 and tens to 80

Telling time (الساعة)

This book vs this is a book (هذا الكتاب، هذا كتاب)

Greetings (مرحبا، السلام عليكم)

How are you? and goodbye (كيف حالك، مع السلامة)

Nationalities (مصري، مصرية)

Roots and patterns (كتب، كتاب، مكتب)

Politeness (من فضلك، آسف)

Complex possession chains

Colors and traits (أفعل / فعلاء)

Plural colors and traits (فُعْل)

Comparative adjectives (أفعل من)

Superlative adjectives (أفعل)

Adverbs of manner (ـاً)

The nominative case (ـُ)

The genitive case (ـِ)

The accusative case (ـَ)

Dual noun cases (ـان / ـين)

Masculine plurals and 'the best of' (أفضل النجارين)

Emphasizing sentences (إنّ)

Connecting clauses (أنّ)

Reporting speech (قال إنّ)

Expressing contrast (لكنّ)

Comparison and probability (كأنّ, لعلّ)

Distant plural pointing (أولئك)

Plural relative pronouns (الذين, اللواتي)

Past habits (كان + present)

Ongoing actions (ما زال)

Masculine plurals online (مبرمجون، مؤثرون)

Perfective past (قد)

Probability (قد)

The subjunctive mood (أن)

Question	Answer
one, one of	أحدahad
documentary	وثائقيwathâ'iqiyy
My female friend watched one of the documentary films.	شاهدت صديقتي أحد الأفلام الوثائقية.shâhadat sadîqatî ahada al-aflâmi al-wathâ'iqiyyah
creature	كائنkâ'in
unique	فريدfarîd
Are you watching a documentary film about a unique creature?	هل تشاهدين فيلما وثائقيا عن كائن فريد؟hal tushâhidîna fîlman wathâ'iqiyyan 'an kâ'inin farîd
wild	بريbarri
threatened	مهددmuhaddad
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.
species	فصيلةfasîla
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
The scientist wanted to preserve one of the unique species.	أراد العالم أن يحفظ إحدى الفصائل الفريدة.arâda al-âlimu an yahfaza ihdâ al-fasâ'ili al-farîdah
habitat	موطنmawtin
The fire ruined one of the natural habitats.	خربت النار أحد المواطن الطبيعية.kharrabati an-nâru ahada al-mawâtini at-tabî'iyyah
predator	مفترسmuftaris
The lion is one of the predatory animals.	الأسد أحد الحيوانات المفترسة.al-asadu ahadu al-hayawânâti al-muftarisah
This predator will not live in one of the cold habitats.	لن يعيش هذا المفترس في أحد المواطن الباردة.lan yaîsha hâdhâ al-muftarisu fî ahadi al-mawâtini al-bâridah
turtle	سلحفاةsulaHfâh
extinction	انقراضinqirâd
One of the turtles is threatened with extinction.	إحدى السلاحف مهددة بالانقراض.ihdâ as-salâhifi muhaddadatun bil-inqirâdi
The turtle walks slowly in its habitat.	تمشي السلحفاة ببطء في موطنها.tamshî as-sulahfâtu bibut'in fî mawtinihâ.
I read an article about the extinction of one of the wild creatures.	قرأت مقالا عن انقراض أحد الكائنات البرية.qara'tu maqâlan 'ani-nqirâdi ahadi-l-kâ'inâti-l-barriyyah
The elephant is one of the threatened wild animals.	الفيل أحد الحيوانات البرية المهددة.al-fîlu ahadu al-hayawânâti al-barriyyati al-muhaddadati
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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