Examining the hotly debated sentences of 'John is easy to please' and 'John is eager to please' in the light of Cognitive Construction Grammar, we have concluded that they typically inherit their form and meaning from two homonymous constructions, which function as Patient-Evaluating Construction and Agent-Evaluating Construction, respectively. In a wider field of vision, we then find that they dominate respectively two and four polysemous inheriting constructions with different degrees of prototypicality，and there is one more related homonymous construction.Our research has proved that establishing Constructional Homonymy may add to Cognitive Construction Grammar more descriptive accuracy and explanatory power.