Graded and ungraded adjectives
Pattern 8: ADJ enough to-infThe adjective is followed by enough and a to-infinitive clause. The to-infinitive clause refers to an action that is possible.
In some cases, the action is performed by the person or thing that is the Subject of the link verb.
Is it likely that she will be alert enough to keep an energetic and inquiring child out of danger?
She was angry enough at Aurora to want to set ground rules.
On the fourteenth day, they found that the pass was free enough of snow to be passable, and they entered Tibetan territory.
Before my 21-year-old son was old enough to get his driver's license, I taught him the rules of the road.
The steel is thick enough not to corrode and therefore it never needs painting.
In other cases, the action can be performed by anyone.
The nectarines should be ripe enough to eat with a spoon.
The city is small enough to explore on foot.