Abstract
The paper answers the question what is and what is not ellipsis and specify criteria for identification of elliptical sentences. It reports on an analysis of types of ellipsis from the point of view of semantic (semantico-syntactic) representation of sentences.
It does not deal with conditions and causes of constitution of elliptical positions in sentences (when and why it is possible to omit something in a sentence) but it focuses exclusively on identification of elliptical positions (if there is something omitted and what) and on their semantic representation, specifically on their representation on the tectogrammatical level of the Prague Dependency Treebanks.