Note entails/necessarily involves Perceive. Perceive is related to Feel. Feel is related to Sad. Sad is the opposite of Decent. 
Classroom is related to Learn. one thing you do when you Listen is Learn. Listen is related to Receive. Receive is related to Exchange. 
Note --Entails--> Perceive <--RelatedTo--> Feel <--RelatedTo--> Sad <--Antonym--> Decent 
Classroom <--RelatedTo--> Learn <--HasSubevent-- Listen <--RelatedTo--> Receive <--RelatedTo--> Exchange 