Where does “что́бы” come from?

что́бы (Russian) comes from Russian что́, from Old East Slavic чьто, from Proto-Slavic čьto, from Proto-Balto-Slavic ki, from Proto-Indo-European kʷíd, from Proto-Indo-European kʷís, from Proto-Indo-European kʷi- — interrogative base.

что́бы (Russian): that...should (indicates the subjunctive)

Definitions

  1. that...should (indicates the subjunctive)

Ancestry of “что́бы”, step by step

что́бы traces back through two separate lines of ancestry.

via Russian что́

StepLanguageWordMeaning
1Russianчто́what
2Old East Slavicчьтоwhat?
3Proto-Slavicčьtowhat
4Proto-Balto-Slavickiwhat
5Proto-Indo-Europeankʷídneuter nominative/accusative singular of *kʷís
6Proto-Indo-Europeankʷíswho, what; who, which, that; which, what
7Proto-Indo-Europeankʷi-interrogative base

via Russian бы́

StepLanguageWordMeaning
1Russianбы́
2Old East Slavicбꙑ
3Proto-Slavic*by

Words derived from “что́бы

Every word from Proto-Indo-European kʷi-Every word from Proto-Indo-European kʷísEvery word from Proto-Indo-European kʷíd