New Words：

warn [wɔːrn] v. 警告；告诫；提醒注意（可能发生的事）；使警惕

warning [ˈwɔːrnɪŋ]
n.警示；警戒；先兆
v.“warn”的现在分词

Sample Sentences：

The police warned us not to go out at night.
I warned them that there might be snakes in the woods.

They attacked without a warning.
The red light is a warning sign for stop.
I'm warning you for the last time stop talking!

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