The subjunctive mood is a verb mood typically used in dependent clauses to express wishes, commands, emotion, possibility, judgment, opinion, necessity, or statements that are usually contrary to fact at present.
The subjunctive mood is Persian is made of the subjunctive form of the verb.
be + Present root
بـ + بن مضارع
Examples of subjunctive form for first person:
b(e) + kon (am)
b(e) + xor (am)
b(e) + rav (am)
b(e) + nush (am)
b(e) + nevis (am)
If the first letter of the Present root was a vowel (except for /i/), bi would be used instead of be:
bi + aay (am)
bi + aamuz (am)
If the first letter was /i/: (istaadan)
be + ist (am)
The Subjunctive form of to be verb does not have any subjunctive prefix (be or bi):