Serbian and Croatian grammer (Bosnian as well) is the same, there is no difference, because all three nations are using the grammer of Vuk Stefanovic Karadzic who reformed the Serbian language in the 19th centenary.. Besides, I must add that it is very nice to see that there are many people who like Serbia and who want to learn our language.. Anyway, everybody who has got questions about the Bosnian / Croatian / Serbian language (its one and the same language, but the three nations are just having three different dialects) can ask me as well. I will help you as far as it is in my possibilities.. Greetings!