He is a clever boy.
He is cleverer than me.
He is the cleverest boy in the class.
She has long hair.
Her hair is longer than his.
I have the longest hair.
We are good friends.
He is better friend than she is.
They are the best friends.
This book is interesting.
That book is more interesting than this book.
This is the most interesting book of all.
This actor is famous.
That actor is more famous than this actor.
This actor is the most famous of all.
It is a difficult task.
This task is more difficult than that one.
These are the most difficult tasks of all.