Abstract
ForFun is an interface for various linguistic research, particularly in describing syntactic functions and their formal realizations in Czech sentences. ForFun draws on the complex linguistic annotation of Prague Dependency Treebanks (PDTs) and arranges morphological and syntactical annotation into new tool which gives a possibility to search quickly and in a user-friendly way all forms (almost 1,500 items) used in PDTs for particular function and vice versa to look up all functions (66 items) expressed by the particular forms.