ahoj, we are twin brothers from Brazil and we like learning languages very much, and we like Czech. we have an English-Czech translator(if anyone wants this translator, you can ask us. it's Microtran). but we would like to know how much Czech we need to speak well. do we need to know all the declensions? is there any way to speak colloquial Czech different from grammatical, without needing to use some declensions(like in German genitive)?