سال‌های عمر سپری می‌شود، بی آنکه تغییر محسوس سریعی اتفاق بیفتد.

Questions & Answers about سال‌های عمر سپری می‌شود، بی آنکه تغییر محسوس سریعی اتفاق بیفتد.

Why does the sentence use the subjunctive verb اتفاق بیفتد at the end?
It is triggered by the phrase بی آنکه (bi ânke), which means 'without'. Just like expressions such as 'before that' or 'so that', بی آنکه requires the following verb to be in the present subjunctive, because it describes a hypothetical event or something that hasn't actually happened.
The subject is plural (سال‌ها, years), so why is the first verb singular (سپری می‌شود, elapses)?
In Farsi, plural inanimate subjects (like objects, abstract concepts, or time periods like 'years') usually take a singular verb. You might occasionally see a plural verb used for poetic effect, but the singular form is the standard, everyday rule.
In the phrase تغییر محسوس سریعی (a fast perceptible change), why is the indefinite ی (-i) at the very end of the phrase?
When you have a noun followed by a chain of adjectives connected by the ezafe, the indefinite ی (meaning 'a' or 'an') is attached to the final adjective in the chain, not to the noun itself. The entire noun phrase acts as one solid block.
Is بی آنکه used in everyday conversation?
Not usually. بی آنکه is quite formal and literary. In everyday spoken Farsi, people almost always use بدون اینکه (bedun-e inke) instead, which means exactly the same thing and also requires a subjunctive verb.
Why does the subjunctive prefix on بیفتد (biyoftad) have a 'y' sound in it?
The verb is افتادن (oftâdan - to fall/happen). To form the present subjunctive, we add the prefix بـ (be-) to the present stem افت (oft). When بـ attaches to a stem starting with a vowel, an extra 'y' sound is added to bridge the gap, making it بیفتد (biyoftad) instead of 'be-oftad'.

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