Porch is related to Addition. Addition is derived from Add. Add is related to Term. Term is related to Matter. 
the last thing you do when you Sing is Stop. Stop is a type of Interrupt. Interrupt is a type of Act. 
Porch <--RelatedTo--> Addition --DerivedFrom--> Add <--RelatedTo--> Term <--RelatedTo--> Matter 
Sing --HasLastSubevent--> Stop --IsA--> Interrupt --IsA--> Act 