13. A system including memory and one or more processors operable to execute instructions stored in the memory, the memory comprising instructions to: identify, in a segment of text, a subject and an action performed by the subject; determine a likelihood that the action is performable by a class of subjects with which the subject is associated, the likelihood based at least in part on a plurality of reference subjects and associated reference actions found in a corpus of textual documents; and provide an indication of the likelihood.
13. A system including memory and one or more processors operable to execute instructions stored in the memory, the memory comprising instructions to: identify, in a segment of text, a subject and an action performed by the subject; determine a likelihood that the action is performable by a class of subjects with which the subject is associated, the likelihood based at least in part on a plurality of reference subjects and associated reference actions found in a corpus of textual documents; and provide an indication of the likelihood. 17. The system of claim 13 , wherein the system further comprises instructions to determine the likelihood based on a question posed about the segment of text.