1. A method of implicitly forming a context in a dialogue with a computer, comprising: forming by a computer a plurality of megacategories, with megacategories being combinations of one or more attributes linking to one response template, of a plurality of response templates with each of the plurality of the formed megacategories linked by associated attributes to a corresponding one of the plurality of response templates; selecting by the computer from the formed megacategories, a suitable megacategory for a present input involved with a dialog with the computer by comparing attributes having true variables from a previous input in the dialog to attributes having true variables in the present input; and selecting by the computer an appropriate response template corresponding to the selected megacategory.