You are the best friend in the world.

a giraffe is the biggest animal in the world.

a zool is the slowest animal in the world.

this men is the stupidst people in the world.

this day is the worst day in my life
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It's the most beautiful day in my life.
My sister is the most clever person on the world.
He's the most craziest boy which I saw.
This is the most interesting book which I read.
This is the most boring film which I saw.