Informal is related to Date. Date is related to Fruit. Fruit can be used for Consumption. Consumption is a synonym of Use. 
Act is a type of Drama. Drama is related to Theater. Theater is related to Concert. you are likely to find Electricity in/at/on Concert. 
Informal <--RelatedTo--> Date <--RelatedTo--> Fruit --UsedFor--> Consumption <--Synonym--> Use 
Act --IsA--> Drama <--RelatedTo--> Theater <--RelatedTo--> Concert <--AtLocation-- Electricity 