1. alert
アメリカ英語 "という言葉ostrzegać"(alert)集合で発生します。
driver license 22. warn
We tried to warn her, but she wouldn’t listen.
We tried to warn her, but she wouldn't listen.
3. give a waring
4. give warning
5. warning
6. warn (not) sb to
7. warn to
8. warned
And warned her to be sure she kept away from it.