The papers explores the concept of functional approach to evaluate students' behaviour through web 3.0-based foreign language learning and the phenomenon of foreign language acquisition from the angle of students' evaluation of their learning process and progress. The key steps to implement the functional behaviour approach to students' learning process are identified. [1] The paper aims to evaluate language acquisition patterns within the web 3.0.-based learning environment by analyzing specific learning process characteristics that are revealed and interpreted with the use of functional approach to students' learning behavior that implies analysis of students' problems, students' interviews with regard to the above problems, the interpretation of interviews. [2] The research included literature review, students' pilot training within web 3.0 Google cloud learning environment, students' interviews and factor analysis of the statistical data.