Ex1:
2. He wasn't good enough to do the job.
3. The ladder isn't long enough to reach the window.
4. The tea isn't strong enough to keep us awake.
5. The fire isn't hot enough to boil the kettle.
Ex2:
a) I am old enough to understand the lessons.
b) She isn't tall enough to hang the picture.
c) He is sociable enough to make friends.
d) It is cold enough to wear sweater.
e) They have enough money to buy new houses.