The manual annotation of Czech sentences is carried out in the framework of experimental verification of the definition of formal representation of the analysis of Czech sentences (the project GAČR 405/96/0198, "Formal representation of language structures"). The material obtained in this way (data) will be made use of in many domains of research in computational linguistics, above all as basic (training) data in projects of language modeling worked out in the framework of the "Laboratory for language data processing" (the project MŠMT VS96151) and of the Center for Computational Linguistics. These data will also be used as verification material for various partial projects within the complex program GAČR 405/96/K214 ("Czech Language in Computer Age"). It is from the mentioned additional sources that manual annotation is supported also financially, especially in order to make available a volume of data sufficient for statistical experiments as well.