Reconstruction:Proto-Slavic/jako

From *jakъ.^[1]

• *ako (According to Trubachyov, the material for *ako/jako? and *jakъ is hard to separate.)

*jako

1. (interrogative, relative) how, in which way

   Synonym: *kako

• East Slavic:
  • Old East Slavic: ꙗко (jako)
    • Old Ruthenian: ꙗкъ (jak), ꙗко (jako)
      • Belarusian: як (jak)
      • Carpathian Rusyn: як (jak), яко (jako)
      • Ukrainian: як (jak)
    • Russian: (archaic) яко (jako)
• South Slavic:
  • Old Church Slavonic:

    Old Cyrillic script: ꙗко (jako)

    Glagolitic script: [Term?]

  • Bulgarian: ако (ako, “if”)
  • Macedonian: ако (ako, “if”)
  • Serbo-Croatian:

    Cyrillic script: а̏ко (“if”)

    Latin script: ȁko (“if”)

  • Slovene: ko (“when”)
• West Slavic:
  • Old Czech: jak, jako
    • Czech: jak, jako
  • Old Polish: jak (“how, if”), jako (“as”)
    • Polish: jak (“how, if”), jako (“as”)
    • Silesian: jak, jako
  • Pomeranian:
    • Kashubian: jak, jakò
    • Slovincian: jak, jakô
  • Old Slovak: ako, ak, jako, jak
    • Pannonian Rusyn: як (jak)
    • Slovak: ako, ak (“if”)

• Trubachyov, Oleg, editor (1974), “*ako / *jako?”, in Этимологический словарь славянских языков (in Russian), numbers 1 (*a – *besědьlivъ), Moscow: Nauka, page 64