Task: Question Answering
Input (English): Passage: Czech syntax has a subject–verb–object sentence structure. In practice, however, word order is flexible and used for topicalization and focus. Although Czech has a periphrastic passive construction (like English), colloquial word-order changes frequently produce the passive voice. For example, to change "Peter killed Paul" to "Paul was killed by Peter" the order of subject and object is inverted: Petr zabil Pavla ("Peter killed Paul") becomes "Paul, Peter killed" (Pavla zabil Petr). Pavla is in the accusative case, the grammatical object (in this case, the victim) of the verb. Question: Because word order is flexible in Czech, what does it tend to actually be used for?
Output (English): topicalization and focus