College can be Expensive. College is related to Secondary. Secondary is related to Green. Green is the opposite of Sweet. 
Let is the opposite of Control. Control is related to Used. Used is related to Bit. 
Expensive <--HasProperty-- College <--RelatedTo--> Secondary <--RelatedTo--> Green <--Antonym--> Sweet 
Let <--Antonym--> Control <--RelatedTo--> Used <--RelatedTo--> Bit 