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Questions & Answers about این درسِ نهم است.
Why does the number come after the word "lesson" here?
In Farsi, ordinal numbers that end in -om (like nohom for "ninth") act just like regular adjectives. They come after the noun they describe and are connected to it using the Ezafe (the invisible -e sound), which is why we say dars-e nohom.
How exactly is the word nohom built?
It is made by taking the standard root number noh (nine) and adding the suffix -om. This -om suffix is the standard way to create Type 1 ordinal numbers (such as "fourth" or "fifth") in Farsi.
Do I need to write a special character for the Ezafe connecting dars and nohom?
No, the Ezafe (the -e sound) is almost never written in standard Farsi text unless the first word ends in a long vowel. Even though you don't see a character for it between dars and nohom, you must still pronounce it to link the noun to its number.
Could I translate in dars-e nohom as "this ninth lesson" instead of "this is the ninth lesson"?
As a standalone phrase, yes! However, because this complete sentence ends with the verb ast (is), in acts as a standalone subject ("This") and dars-e nohom is what it equals ("the ninth lesson"). If you wanted to say "This ninth lesson is long," you would use that whole phrase as the subject: in dars-e nohom boland ast.