The paper informs about contemporary attitudes of teachers and their perception of errors occurring in the selected grammatical čems by pupils of the third and fourth grade of primary school. Mapping of pupils errors in grammatical items and verifying the assumption that constructivist cognitive stimulation is carried out in the linguistic area that has the character of language universals, is one of the tasks of particular research " Relationship between the cognitive structures of pupil and the structures of language in the education system of the Czech language ," which is supported by the Grant Agency of the Czech Republic ( GA ČR ).