She was kind enough to show me around the town.
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She was kind enough to invite me to her birthday party.
She was so kind as to invite me to her birthday party.
She was so kind that she could invite me to her birthday party.
The book is cheap enough for children to buy.
The book is so cheap that children can buy it.
The problem is easy enough for me to solve without your help.
He was so careless as to leave his key in his car.