تا جایی که من آگاهی دارم، هیچ‌کس منبع این خبر را نمی‌داند.

Questions & Answers about تا جایی که من آگاهی دارم، هیچ‌کس منبع این خبر را نمی‌داند.

Why does آگاهی دارم use the indicative mood here instead of the subjunctive?
The phrase تا جایی که (as far as) introduces a clause of extent. Because you are stating a factual boundary about the actual limit of your current knowledge, it takes the indicative mood (دارم). If it were a hypothetical boundary, it might take the subjunctive, but here you are confirming what you definitely know right now.
Could I just say تا جایی که من می‌دانم instead of using آگاهی دارم?
Yes, تا جایی که من می‌دانم (as far as I know) is perfectly correct and very common. Using آگاهی دارم (literally 'I have awareness') is simply a slightly more formal or polished way to express the exact same idea.
Why is the verb نمی‌داند negative when هیچ‌کس already means nobody?
Farsi uses negative concord, which means 'double negatives' are required grammatically. Whenever you use a negative word like هیچ‌کس (nobody) or هیچ‌چیز (nothing), the main verb must also be made negative. So it literally translates to 'nobody does not know' but simply means 'nobody knows'.
Why is the object marker را placed after این خبر and not right after منبع?
The entire phrase منبع این خبر (the source of this news) acts as the complete direct object of the sentence. The marker را always attaches to the very end of a noun phrase, even when that phrase links multiple words together using the ezafe.

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