"I will have to warn you that there is a troll on the other side of the bridge."
I tried to warn you that those brakes were worn out.
Washington did warn against growing political conflicts within the nation because they did destabilize the nation.
The to and too are mixed up. It should be: She yelled to warn him but it was too late.
Washington did warn against political parties. He was very persistent in saying they were bad for our nation's growth.
Warn is a verb, as in to notify or make someone aware of a danger, Also to advise against some action or conduct
To warn and protect people against fires.
The captain signaled the ship's approach to the harbor with a loud blast from the foghorn.
The men warn Baron Christian de Neuvilltte about Cyrano's nose.
See Mark 3:28-30.
The mother cheetah gave a high-pitched sound to warn her children.
I tried to warn her not to marry the man she had only met last week, but she was so impetuous that she had married him even before I had a chance to warn her. The IMPETUOUS winds blew the umbrella away.