incomplete. Languages which have the grammatical means of indicating that an action is complete or incomplete are described as having an aspect system. Consider the following example. In answer to the question: (3) What did you do last night? one could answer: I finished reading my book; or I was reading my book. In Russian one would use in the equivalent of I finished reading my book the perfect form of the verb ‘read’ instead of the lexeme ‘finished’ to indicate that the action has been completed.