بایستن

See also: پایستن‎

Persian

Pronunciation

• (Classical Persian): IPA^(key): /bɑːjistan/

• (Dari): IPA^(key): /bɒːjɪstan/

• (Iranian Persian): IPA^(key): /bɒːjestæn/
• (Tajik): IPA^(key): /bɔːjistan/

Verb

Dari Persian	بایستن
Iranian Persian
Tajik	боистан (boyistan)

بایستن • (bâyestan) (present stem بای‎ (bây))

1. (defective, auxiliary) to be necessary; must, ought

Conjugation

Only the following conjugations now exist:

• باید‎ (bâyad, etymologically third-person singular present, literally “it is necessary”), extremely commonly used as the equivalent to English constructions with "must", "should", "ought to", "have to", etc.
• می‌بایست‎ (mi-bâyad), synonymous to باید (bâyad) but less common
• ‌بایست‎ (bâyest, etymologically third-person singular past), usually largely synonymous to باید (bâyad) despite the use of the past stem, but less common and somewhat more polite; more pedantic usage may have this mean "should have", "must have", etc., preserving the past tense
• می‌بایست‎ (mi-bâyest), synonymous to بایست (bâyest)
• بایستی‎ (bâyesti, etymologically second-person singular past) and می‌بایستی‎ (mi-bâyesti, etymologically second-person singular imperfect), both rather archaic and used to express any past necessity without regard for grammatical person

Derived terms

• بایستی‎ (bâyesti, “necessity”)