It has been assumed not only by linguists but also by philosophers and psychologists that causation is a function over two events. Using the semantic function CAUSE as a common element underlying all the verbs which imply causation, we can formulate this assumption as in the following: (1) CAUSE(E1, E2) (E=EVENT) The purpose of the present paper is to discuss whether or not the above assumption is valid in terms of linguistic semantic representation. Section 1 gives an outline of the analyses based upon the assumption. It deals with the treatments made by scholars from various fields, such as Davidson (1967), Vendler (1967), Miller & Johnson-Laird (1976), Dowty (1972) and Schank(1973). Section 2 is concerned with how to define the event ...