The main purpose of this paper is to investigate the influence of maternal and paternal languages on the development of a bilingual child’s language. It is assumed that a mother’s language has the greatest influence on a child’s language. In addition, maternal language is responsible for the largest part of the variety in the language children understand and use as well as the development of bilingualism. We also believe that fathers influence the language of a home and mothers influence the language of a child. In our analysis, the focus is on the quantity and quality of exposure to the given languages, the pattern of language used by parents, the language of formal instruction and the style of parentchild interaction. Over one hundred and fifty case studies were under examination depicting various language constellations, such as e.g. Polish and English, Polish and Russian, Polish and German, Polish and Ukrainian, Polish and Belarusian, Polish and Italian. Hence, with this paper we hope to be able to better understand cross-linguistic influence on bilingual speakers.

The article summarizes the results of sociolinguistic study of the language environment of secondary schools in Ukraine, on the basis of which the conclusion about its bilingualism was made. It is proved that the quality of the language environment does not correspond to the declared school status. Changes in the assessment of the language environment of schools from 2006 to 2017 are identified and it is concluded that it is possible to develop recommendations for improving the legal support of the use of languages in the Ukrainian education.

The aim of the paper is to discuss the existing CLIL models with respect to how they are used by teachers in Polish lower–secondary education. Throughout the paper a general situation in the system of education concerning bilingual classrooms is depicted with the focus on four CLIL models traditionall used in contemporary schools. The overall objective is to analyse the popularity of languages employed as the medium of instruction in bilingual provision, the subjects whose content is imparted through the medium of a foreign language as well as the four major curricular models themselves developed and implemented for the needs of bilingual programmes in the Poland.