مردم ایران قومیت‌های متفاوتی دارند.

Questions & Answers about مردم ایران قومیت‌های متفاوتی دارند.

How does the suffix یت change the meaning of the root word in قومیت?
The root is the Arabic word قوم (qowm), which means a "people," "tribe," or "nation" (a physical group of people). Adding the abstract suffix یت (-iyyat) turns it into the abstract concept of "ethnicity." This is a very common way to create formal abstract nouns in Persian.
Since this is an Arabic-derived abstract noun, could I use the Arabic plural suffix ـات (-at) instead of ـها?
For this specific word, no. While a few words ending in یت do take the Arabic plural (like موفقیت‌ becoming موفقیت‌ها or rarely موفقیات), قومیت‌ها is the only standard way to say "ethnicities." The native Persian plural suffix ـها is highly productive and is the safest, most natural choice for these derived abstract nouns.
Why is the indefinite suffix ی attached to the adjective متفاوتی instead of the noun?
In Persian, when a noun is described by an adjective using the ezafe (the connecting vowel), the indefinite suffix ی (meaning "a" or "some") attaches to the very end of the noun phrase. It skips the noun itself and attaches to the end of the modifier: قومیت‌های متفاوت + ی.
The word مردم (people) doesn't have a plural suffix. Why does the verb دارند take a plural ending?
مردم is a collective noun. Even though it is singular in form, it refers to a group of humans, so it almost always takes a plural verb in modern Persian. This is exactly like how "people" takes a plural verb in English.

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