Pronunciation

change

Plain form
warn

Third-person singular
warns

Past tense
warned

Past participle
warned

Present participle
warning

  1. If you warn someone about something, is to make them aware of a danger approaching.
    I warn you, lions are dangerous.
  2. If you warn someone can also be to make them aware that something they do is not accepted.
    It is not allowed to steal, I warn you.
  3. If you warn someone, you give a warning.