Learn Farsi: ممکن است بازرس حساب‌های بانک را کاملاً بررسی کرده باشد. - The inspector might have completely checked the bank accounts.

This is the Present Perfect Subjunctive. It is built by taking the past participle of the verb, which is karda (from kardan, meaning "to do"), and adding the subjunctive form of the verb "to be", which is bâshad for the third person singular. We use this tense here because momken ast ("it is possible") requires a subjunctive verb, and we are talking about an action that might have happened in the past. Together with barrasi ("investigation"), barrasi karda bâshad means "might have investigated" or "might have checked".

Why is râ placed after bânk instead of right after hesâb-hâ?

The word râ marks the entire specific direct object of the sentence. Here, the direct object is not just the accounts (hesâb-hâ), but the whole linked phrase "the bank accounts" (hesâb-hâ-ye bânk). Therefore, râ must come at the very end of this noun phrase.

What is the ending on the word kâmelan?

The -an ending is an adverb marker borrowed from Arabic. It attaches to the adjective kâmel ("complete") to make it the adverb kâmelan ("completely"). You will often see this written in Farsi script with two small diagonal lines on top of an Alef letter at the very end of the word.

Is bâzras the subject of momken ast or barrasi karda bâshad?