The thesis looks into the differences in English pronunciation by Czech and Spanish speakers with a focus on weak syllables and weak forms. The theoretical part presents and discusses the information about the "schwa" sound and its use in English, Czech and Spanish. The thesis also includes a study using two groups of respondents, Czech and Spanish. They will fill in a questionnaire about their knowledge of English and its pronunciation, and read a set of words and sentences (focusing on the use of weak syllables and weak forms) which will be further analysed and compared.