After a brief characterization of the theory of the topic-focus articulation of the sentence (TFA), rules are formulated that determine the assignment of appropriate values of the TFA attribute in the process of syntactico-semantic tagging of a very large corpus of Czech.

The procedure of reconstruction of the underlying structure of sentences (in the process of tagging a very large corpus of Czech) is described, with a special attention paid to the conditions under which the reconstruction of ellipted nodes is carried out.