Would: the conditional with бих

The conditional (English would) is бих plus the past participle in -л:

• аз бих, ти би, той / тя би, ние бихме, вие бихте, те биха
• the participle agrees with the subject: купил (m), купила (f), купили (plural, and also polite вие)

Use it for polite requests and wishes: Бих искала кафе (I would like a coffee), Бихте ли ми казали...? (Could you tell me...?).

It also describes unreal situations, usually with ако and a past verb: Ако имах време, бих ти помогнал (If I had time, I would help you). In everyday speech щях да + present is common here too: щях да ти помогна. The negative is не бих or нямаше да, never не щях да: На твое място не бих подписал (In your place I wouldn't sign).