He warned me not to be late.

他提醒我不要迟到。

《牛津词典》

He warned me not to touch it.

他警告我不要碰它。

youdao

He warned me against pickpockets.

他警告我提防扒手。

youdao

He had warned me ahead of time that this mission critical call might come.

FORBES: Cell Phone Time Machine

His staff had warned me that he was more "techie" than I might have expected, and that proved to be the case.

BBC: Tech City - by Royal Appointment

"As long as I can remember my dad had repeatedly warned me of certain people and their ways, " he tweeted.

CNN: STORY HIGHLIGHTS