5. This coat isn't rich enough for me to wear in winter.
6. Robinson isn't rich enough to buy a house.
7. He wasn't experienced enough to do the job.
8. You aren't old enough to have a front-door key.
9. He didn't have enough money to live on.
10. The buffalo isn't big enough to harm you.
11. The ice is so thick that we can't walk on it.
12. The tea isn't strong enough to keep us awake.
13. The novel is so interesting that we can read it.