705　warn sb. of/about和warn sb. against

① warn sb. of/about意为“提醒/告诫某人……注意”，后接名词或动名词。

She warned him about/of the serious situation that confronted them. 她提醒他注意他们所面临的严重形势。

He was warned of the danger. 他被告知要注意危险。

② warn sb. against意为“提醒/告诫某人……不要”，后接名词或动名词，意同warn sb. not to do sth.。

The doctor warned him against smoking. 医生提醒他不要抽烟。

She warned him against telling lies. 她警告他不要撒谎。

她告诫孩子们不要在这一带河里游泳。

She warned the children not to swim in that part of the river.

She warned the children against swimming in that part of the river.

提示

warn sb. of/against均可表示“提醒某人……提防”。

The driver warned us of/against pickpockets. 司机提醒我们提防扒手。