It was foolish of them to have brought children into the world.

But it would be foolish of her not to try.

Foolish of me, who had so little to offer anyone.

It would be foolish of me to say his name here.

"It would be foolish of the Congress to form a government now."

But it was foolish of you to get so near them.

It was foolish of me, but I really had to know.

In the end, that might have been foolish of him, but he did not think so.

All the more foolish of her to have opened the door to him in the first place.

It would be foolish of us not to do so.