Hello Daniel! Both are prepositions. (Ambos são preposições). Falar de: eu falo de música, você fala de cinema (I speak about music, you speak about movies) Falar em: eu falo em português, você em inglês (I speak in portuguese, you in english) A sua dúvida é interessante: você precisa entender do que está falando para usar a preposição correta (Your doubt is interesting: you need to know what you're talking to use the correct preposition). Falo de: about things, places. Ex: Eu falo da bahia como se morasse lá (I speak of Bahia as I live there) Falo em: when I be in one place, when I speak one language, etc. Ex: só falo português em casa; no trabalho, falo com todos em inglês (I only speak portuguese at home; on work, I talk with everything in english) If you have more doubts, please contact me (Se você tiver mais dúvidas, por favor entre em contato comigo). ;)

I don't know any things about Russia, but I like these big castles, and the cold weather! How Is the Russian cuisine? Sorry If I wrote wrong words, I'm brazilian and I'm learning to speak english :)

Wow, It's interesting, but I don't know anything about leopards to help you, but you can check in Wikipedia (www.wikipedia.org/leopard) to read about this. Let's read and enrich your knowledge!