It is a common misconception. Knowing two slavic languages from different branches (e.g. west and east slavic groups) improves your comprehension of other slavi

It is a common misconception. Knowing two slavic languages from different branches (e.g. west and east slavic groups) improves your comprehension of other slavic langauges a lot, but even that still often not enough. I speak 2 slavic languages but found myself confused with simple everyday phrases in others.