Как пишется по англиски слово умный?

 умный — clever

He is a clever boy. 

My friend has a very clever dog.

She studies well, she is the cleverest boy in our class.

There are many clever pupils in my class.

He has read many books, he is very clever.

We thought the dog is clever.

They study at the same class and both of them are very clever.

Mary is cleverer than Mike. 

Tom is the cleverest person I have ever met.

clever — cleverer — the cleverset

smart,