This study is to outline the problematic of English technical language commonly used by Czech economists and civil engineers. Close attention is focused on observing the most common mistakes made by Czech speakers in the field of economy, business and civil engineering. The research is built on analysing semantic, morphological and syntactical distinctions between individual language units. The result of the research is particularly seminal to fully understand the subtleties of English professional language upon economy, business and civil engineering and acquire the relevant lexis when confronted with professional terms.