Abstract:​ Diploma thesis called​ Pupil with a different mother tongue​ concerns the topic of pupils with a home language different from the language of communication of the country they are in. In the theoretical part, the thesis describes the situation of these pupils in the Czech republic and in the world, especially the topic of bilingualism which reflects the situation of pupils with a different home language which already use the second language in various degrees. Next, it deals with intercultural communication, support of these pupils in school and methods of maintaining both languages (native and second). Practical part is based on observation of bilingual children in a particular Czech school in England, further on analyzed language utterances of children with a different home language and on semi-structured interviews with some bilingual families (children and parents) in England and in the Czech republic. Interviews concern the maintenance of mother language and situations regarding usage of both languages by questioned children in families and in school. The aim of the thesis is to describe the situation of pupils with a different home language in family and in school in England and in the Czech republic and to find out how families deal with maintenance of mother language and which of both...