This bachelor thesis is concerned with the role of Czech-English interlanguage homonymy in the process of second-language acquisition. The aim is to prove or disprove that the Czech learners are not in general very well acquainted with Czech-English interlanguage homonyms and that various factors heavily influence the depth of their knowledge. The theoretical part provides a brief overview of the synchronic and diachronic development of both the Czech language and the English language, including the influence of the English language on Czech and their mutual history. A further focus is on explaining homonymy and the theory of interlanguage and its influence on second language acquisition. The practical part is based on a questionnaire and a...