Are Bulgarian and Macedonian fundamentally different than all of the other Slavic languages grammar-wise? I'm familiar with all of the common differences with cases, tenses, verbs of motion, yada yada. However, do these differences give Bulgarian and Macedonian a different core structure than the other Slavic languages? I've tried reading some texts in other Slavic languages such as Russian, Serbian, and Polish and sometimes the language seems completely transparent, at least when the unfamiliar vocabulary is translated. Other times, sentence structure seems to be completely different and the logic behind why it is structured that way is different too. Am I exaggerating these differences? When did Bulgarian and Macedonian first exhibit this split from the other Slavic languages?