Once warned, he might have some suggestion of something we could do.

That was the first sign of madness, his mother had once warned him.

For the generation that once warned not to trust anyone over 30, suddenly 40 is beautiful.

And troops, once warned, can easily protect themselves with the right equipment.

Be careful of what you fear most, Calyx had once warned.

That means, she was warned once for not having at least one foot on the ground; then she did it again.

The fellow had been warned once; that was enough.

It is true that the nation's founding father, George Washington, once warned against such a system.

"Socrates once warned that the only true evil is ignorance," he continued.

Heinzelmann once warned a colonel to be careful on his daily hunt.