Little words

what

Source:*čьtoProto-Slavicprobable

West Slavic co comes from *čьso, the rest from *čьto. Ukrainian що is usually traced to *čьto, though some derive it from *čьso.

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English

what

Polish

tsɔ

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In all five languages

BCS script

Latin under Cyrillic

Russian
чтоčto
ʂtoinherited
Spelled ч, said ш.
Ukrainian
щоščo
ʃtʃɔinherited
Polish
co
tsɔdifferent word · Proto-Slavic *čьso, the same pronoun *čь with another particle
Czech
co
tsodifferent word · Proto-Slavic *čьso, the same pronoun *čь with another particle
Bosnian-Croatian-Serbian
štoшто
ʃtoinherited
Standard-specific words: šta (Serbian, Bosnian) — Used alongside što.
English
what