On Several Problems Concerning if-then Proposition in the Textbook General Logic

There exist some problems concerning the if-then proposition in the textbook General Logic, including the tautology in defining the if-then propositions under three different conditions, the improper definitions of the three conditions, obvious mistakes in the examples of essential and necessary conditions, some omission in the statement of the types of expressing mode in Chinese of if-then proposition on essential and necessary condition. This paper makes a clear demonstration of these problems and suggests some amelioration and reparation to them.