1. He is intelligent. He can answer all the questions.
He is intelligent enough to answer all the questions.
2. He isn't tall. He can't reach the shelf.
 He isn't tall enough to reach the shelf.
3. She is good. She'll pass the exam.
 She is good enough to pass the exam.
4. You aren't well. Don't go to school.
You aren't well enough to go to school.
5. They are sociable. They can make a lot of friends.
They are sociable enough to make a lot of friends.