One of the notable behaviours of individuals during the teaching of foreign languages is the use of the first language as an integral part of the learning-teaching process. This situation can also negatively affect the learning of a foreign language. The aim of this study is to determine the reasons why secondary-school students in Kazakhstan feel the need to use their first language (Kazakh or Russian) in foreign language classes where they are studying English. The research, based on the general screening model, was conducted in Astana, the capital of Kazakhstan, in three middle schools with a group of 296 11th grade students. The data was obtained by using an attitude scale consisting of four factors which was developed by Ocak, Kuru and Ozchalishan (2010).The scale factor-loads varied between 0.35-0.85; and reliability was found to be Alpha=0.71. According to the findings, students avoid the use of the foreign languages they study; have motivation problems; have a fear of being criticized by teachers; have a fear of being teased by classmates; tease their friends; and don't believe in themselves enough. It is therefore necessary to take measures to increase the self-confidence of students; and a more English-speaking environment should be established.