Russian Conditional Mood: Past Forms with бы

Add бы to a past-tense form: я бы прочитал (masculine speaker), я бы прочитала (feminine speaker), мы бы прочитали (plural). The past-form ending agrees in gender in the singular and in number in the plural; it does not change for person.

Compare я прочитал письмо (I read the letter) with я бы прочитал письмо (I would read the letter). The same verb shape can describe an actual past event without бы or an imagined action with бы.

Context places the hypothetical action in time: сегодня, завтра, or вчера can all accompany a past-form verb with бы. An unreal event in the past often needs more context to make the time clear.

Aspect still matters: я бы прочитал книгу presents a single completed result; я бы читал книгу focuses on reading as an activity. Бы does not force either aspect.

For an open future possibility, use ordinary future forms: если завтра будет тепло, мы пойдём гулять. For an imagined condition, use если бы plus a past form in the condition, usually with бы and a past form in the result.

Compare если он придёт (if he comes: a live possibility) with если бы он пришёл (if he came / had come: imagined). The surrounding time expressions and context distinguish a present or future counterfactual from a past regret.

The same form works without an if-clause: я бы хотел узнать asks politely, while я хочу узнать states a wish more directly. Хочу and хотел бы are not interchangeable in tone.

For a wish, use a construction such as вот бы + past form or я бы + past form. Polite requests may be questions: не могли бы вы помочь? Here могли agrees with polite plural вы.

Бы is a separate particle, not a verb ending. In neutral sentences it often follows the subject or verb: я бы пошёл, я пошёл бы. In an imagined if-clause, если бы introduces the condition.

Some flexible placements change emphasis rather than the basic conditional meaning. Keep бы visible in each relevant clause when building a two-clause hypothetical.