معمار پنجره را باز کرد، به‌طوری‌که نور مستقیم عبور کند.

Questions & Answers about معمار پنجره را باز کرد، به‌طوری‌که نور مستقیم عبور کند.

Why is the verb عبور کند in the subjunctive when the first half of the sentence is in the past tense?
The conjunction به‌طوری‌که (be tori ke) means 'so that' or 'in such a way that'. Because it introduces an intended result or purpose—not a confirmed fact—it requires the subjunctive mood (عبور کند), even if the action in the main clause happened in the past (باز کرد).
Could I just use تا instead of به‌طوری‌که in this sentence?
Yes, you can. Both تا and به‌طوری‌که can mean 'so that' and trigger the subjunctive when expressing an intention. However, به‌طوری‌که is a bit more descriptive and formal, emphasizing that the window was opened 'in such a way that' allows the light to pass.
How do we know مستقیم means 'directly' (adverb) and not 'direct light' (adjective)?
In spoken Farsi, it comes down to pronunciation. If it were 'direct light', you would hear the connecting 'ezafe' vowel: نورِ مستقیم (noor-e mostaghim). Without the ezafe, نور (noor) stands alone as the subject, and مستقیم acts as an adverb modifying the verb. In Farsi, many adjectives can be used as adverbs without adding any extra endings.
Why use the compound verb عبور کردن for 'passes' instead of another verb like گذشتن?
عبور کردن specifically means 'to pass through' or 'to cross a physical barrier' (like light passing through a window opening, or a person crossing a street). گذشتن is a more general 'to pass' (like time passing, or passing by a building).

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