A modal form is a provision of syntax that indicates the predication of an action, attitude, condition, or state other than that of a simple declaration of fact. The modality of a grammatical form is the quality or state in question. These include the assertion or denial of any degree or manner of affect, belief, certainty, desire, obligation, possibility, or probability on the part of the utterer. Another definition of modality is given as follows: "the relativization of the validity of sentence meanings to a set of possible worlds. Talk about possible worlds can thus be construed as talk about the ways in which people could conceive the world to be different" (Kiefer 1994:2514).
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