The topic sentence is usually found at the beginning of the paragraph
Strange and exotic.
If there is an adjective after the noun, its predicate adjective.
When someone hurts you, the desire for retribution is strong.
Retribution means punishment or revenge.
Its to help you understand what all the symbols mean. Youre looking at a city that has a symbol by it, and you dont know what it means so you look at the map key and it tells you.