In order to use a verb in conditional mood in Polish language, you need to know how to conjugate a verb and add the particle BY before ending in appropriate form:

There are 6 endings of a verb depending on gender and number here: -ł(m), -ła(f), -ło(n), -li(m, pl), ły(f, pl). After these endings you have to add the particle BY in appropriate form: -bym(ja), -byś(ty), -by(on, ona), -byśmy(my), -byście(wy), -by(oni).

For example:  Czekać – to wait, JA CZEKA-Ł-BYM – I would wait

Let’s consider how to do it with the verb OTWIERAĆ – to open.

Ja otwierałbym

Ja otwierałabym

I would open
Ty otwierałbyś

Ty otwierałabyś

You would open
On otwierałby

Ona otwierałaby

He would open

She would open

My otwieralibyśmy

My otwierałybyśmy

We would open
Wy otwieralibyście

Wy otwierałybyście

We would open
Oni otwieraliby

One otwierałyby

They would open


Ja mógłbym podreperować ten rower – I would be able to repair this bicycle (reperować/podreperować – to repair, ten – this, rower – bicycle)

Ona nie otworzyłaby drzwi – She would not open the door (drzwi – door)

Pracowałby Pan w banku? – Would you(formal, masculine) work in a bank?

Co Państwo kupowaliby? – What would you(formal, plural, masculine) buy?

Grałbyś z nami? – Would you play with us? (grać/zagrać – to play)

Also, the particle BY is part of the words ABY, ŻEBY – to/in order to; JEŚLIBY, JAKBY, GDYBY – if (would). It means that one will have to use appropriate form of the particle according to the context. In case if you use BY with these words – there will not be the particle BY in end of verb that is after these words. For example:

Abyś robił to, byłbyś bogaty – If you did it, you would be rich. Abyś robiłbyś (bogaty – rich)

Jeśliby oni mi powiedzieli! – If they told me! Jeśliby oni mi powiedzieliby

Gdyby Pani wypróbowała to wino, byłaby zadowolona!  – If you(formal, feminine) try this wine, you would be glad! (zadowolon – glad, ta – this(f), probówać/wypróbować – to try)

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