Necessity is a synonym of Essential. Essential is related to Life. Life is related to Game. 
one thing you do when you Driving is Careful. one thing you do when you Driving is Sing. you would Sing because Enjoy. Enjoy is related to Reading. 
Necessity <--Synonym--> Essential <--RelatedTo--> Life <--RelatedTo--> Game 
Careful <--HasSubevent-- Driving --HasSubevent--> Sing --MotivatedByGoal--> Enjoy <--RelatedTo--> Reading 