InflectionalUnit is the class of functional units whose members designate such grammatical categories as tense, aspect, mood etc. The various forms of an InflectionalUnit plus the stem forms a grammatical paradigm and express a grammatical contrast that is obligatory for its stem's part of speech in some given grammatical context. An inflectional unit does not alter the part of speech feature of the root or stem it attaches to. It is typically located farther from its Root than a derivational unit and produces a predictable, nonidiosyncratic change of meaning [Crystal 1980,184; Hartmann and Stork 1972,112; Bybee 1985,2, 99].