The article describes an experimental study of the Techno-R technology which is being developed at the Kazan Federal University. Techno-R technology is corrective and is designed to correct the communicative competence of trainees. This article describes an experiment to correct the grammatical skills of the French language using the example of teaching the relative pronouns qui, que, dont. The authors show how to implement a generalized approach to educational tasks, organize training and use of grammatical skills in speech. The article describes the procedural side of the Techno-R technology, which includes sequential stages - setting the educational task, mastering the tentative basis of speech actions, training in the performance of the educational task, control actions of the trainees and the teacher themselves, determining the level of the formed competence. To determine the validity of the results obtained in the experiment, the method of mathematical statistics "Student's t-test" was applied. The calculation was carried out according to the established parameters for comparing the results obtained before and after experimental training. The parameters were expressed in a digital assessment of the quality of a foreign language speech (written statement). The calculation according to the "Student's t-test" showed a value of t> 2, namely t = 3.873, which indicates the validity of the experimentally obtained data and the effectiveness of the "Techno-R" technology in the field of teaching grammatical phenomena of the French language.