The article explores the difficulties that may arise in communication between native speakers of different languages (namely English and Czech), although they may be using English as the common language of communication. The aim is to show that the different systems of the respective native languages force the communicators to employ strategies of expression which are characteristic of one of the languages but not readily transferable into the other language. Moreover, the language systems often reflect even broadly conceived cultural differences, and affect the ways in which native speakers perceive and understand reality.