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This thesis examines the argument structures of applicative and causative verbs in Sesotho, and proposes conditions which they must comply with. It is argued that the two conditions in question are in fact general conditions on argument structure rather than restrictions specific to the individual suffixes. The first, the Thematic Hierarchy Condition, which accounts for the unacceptability of unaccusative verbs and experiencer verbs with a Benefactive argument, follows from a universal tendency to have the highest thematic role as the external argument. The second, the Internal Argument Principle, which accounts for the unacceptability of the applicative and causative suffixes with verbs that take two obligatory internal arguments, follows from the fact that basic verbs across languages take no more than two internal arguments. It is argued that this second principle does not follow from Case Theory or Theta Theory. This thesis also demonstrates that the distinction between structural and inherent Case plays an important role in morphology. It accounts for certain differences between causatives and applicatives, including the unacceptability of causative verbs with an S$ sp prime$ complement and the order in which the applicative and causative suffixes appear.
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