Gather is a type of Reason. Gather is related to Coming. Coming is related to Join. Join is the opposite of Leave. 
People can be Silly. People is related to Grave. Grave is related to Cross. Cross is related to Tea. 
Reason <--IsA-- Gather <--RelatedTo--> Coming <--RelatedTo--> Join <--Antonym--> Leave 
Silly <--HasProperty-- People <--RelatedTo--> Grave <--RelatedTo--> Cross <--RelatedTo--> Tea 