vt.警告；告诫；预先通知

vi.发出警告

He warned me against going there at night. 他警告我晚上不要到那去。

They warn her that if she do it again she will be sent to prison. 他们警告她说她再这么干就把她关进监狱。

I warned them that there might be snakes in the woods. 我提醒他们树林里可能有蛇。

If you can't arrive there on time, you should warn them. 如果你不能按时到达，应该预先通知他们。

Birds sometimes chatter to each other to warn of danger. 鸟儿有时互相啁啾,通报危险。

warn的意思是“警告,告诫”,强调及时发现正在来临的或可能发生的危险或冒险,给人以忠告,从而可能避免危险或难堪的处境。

warn只用作及物动词,可接名词、代词、that从句作宾语,也可接由that从句充当直接宾语的双宾语。warn还可接以介词短语、动词不定式充当补足语的复合宾语。

warn可用于被动结构。