Sad is related to Sack. Sack is a type of Take. Take is related to Medicine. 
Dog is related to Spot. Spot wants (to) Run. you would Run because Scared. 
Sad <--RelatedTo--> Sack --IsA--> Take <--RelatedTo--> Medicine 
Dog <--RelatedTo--> Spot --Desires--> Run --MotivatedByGoal--> Scared 