frame-based lexical database that associates each word in the database with a semantic frame and semantic roles, is also associated with annotations at the lexical level. WordNet [@fellbaum98wordnet] is a very widely used online lexical taxonomy which has been developed in numerous languages. WordNet nouns, verbs, adjectives and adverbs are organized into synonym sets. PropBank, FrameNet, and WordNet cover the word senses and argument-taking properties of many modal predicates.

The Prague Dependency Treebank [@PDT10; @trmanEn2005] (PDT) is a multi-level system of annotation for texts in Czech and other languages, with its roots in the Prague school of linguistics. Besides a morphological layer and an analytical layer, there is a Tectogrammatical layer. The Tectogrammatical layer includes functional relationships, dependency relations and co-reference. The PDT also integrates propositional and extra-propositional meanings in a single annotation framework.

The Penn Discourse Treebank (PDTB) [@Webber:2003; @PRASAD08.754] annotates discourse connectives and their arguments over a portion of the Penn Treebank. Within this framework, senses are annotated for the discourse connectives in a hierarchical scheme. Relevant to the current work, one type of tag in the scheme is the Conditional tag, which includes hypothetical, general, unreal present, unreal past, factual present, and factual past arguments.

The PDTB 