Classify is a type of Restrict. Grade is a type of Classify. 
Situation is related to Date. Date is a type of Determine. Tax is a type of Determine. Tax is a synonym of Assess. 
Restrict <--IsA-- Classify <--IsA-- Grade 
Situation <--RelatedTo--> Date --IsA--> Determine <--IsA-- Tax <--Synonym--> Assess 