درسِ دهم خیلی مهم است.

Breakdown of درسِ دهم خیلی مهم است.

خیلی
very / many (of)
مهمmohemm
important
درسdars
lesson
دهمdahom
tenth

Questions & Answers about درسِ دهم خیلی مهم است.

How is the word for tenth formed in this sentence?
The word for tenth is dahom. It is formed by taking the regular number for ten, dah, and adding the ordinal suffix -om. This is the standard way to create Type 1 ordinal numbers in Farsi.
Why does tenth come after lesson, and what links them together?
In Farsi, ordinal numbers ending in -om behave exactly like adjectives. Because adjectives come after the noun they describe, the number must go after the noun. You then use the Ezafe connector (the "e" sound) to link them together, making it dars-e dahom.
Is it possible to put the number before the noun, like we do in English?
Yes, but you would have to use a different form of the number. Farsi has Type 2 ordinal numbers that end in -omin (like dahomin). Those go before the noun and do not use the Ezafe, so you would say dahomin dars. When you use the -om ending like we do here, it must follow the noun.
Why is there a small diagonal line under the word for lesson?
That mark is a kasra, which visually represents the short "e" sound of the Ezafe (dars-e). In everyday written Farsi, this connection is usually invisible and you just have to know it is there from context. However, language learning materials often write it out to help you remember to pronounce it.

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