Polish by

← Proto-Slavic *by (inherited)

→ Polish aby (suffix)

→ Polish żeby (suffix)

→ Polish byśmy (suffix)

→ Polish gdyby (compound)

→ Polish bynajmniej (compound)

→ Polish jakby (compound)

→ Polish niby (compound)

→ Polish niechby (compound)

→ Polish czyżby (suffix)

→ Polish jeśliby (suffix)

→ Polish jeżeliby (suffix)

→ Polish choćby (suffix)

→ Polish aniżeliby (suffix)

→ Polish niżeliby (suffix)

→ Polish niżby (suffix)

→ Polish niźliby (suffix)