以下是一些使用"warn"的句子示例：
I'll run ahead and warn them.
I tried to warn him，but he wouldn't listen.
He shouted to warn me.
She warned us about the serious situation.
He warned us against pickpockets.
We warned them not to skate on such thin ice.
She was warned that if she was late for work again，she would lose her job.
Ann warned me to read the instructions.
They warned him against swimming in the lake.
I have warned him that it is not allowed.
We warned him of the danger.