1
warn sb of/about sth
The police warned the public about the dangerous criminal.
警方警告公众注意危险罪犯。
警告；提醒
先理解核心含义，再看它在真实句子里的用法。
警告；提醒
to tell someone about danger, risk, or possible harm
The police warned the public about the dangerous criminal.
警方警告公众注意危险罪犯。
使(某人)意识到(即将发生的事情)；尤其是
To make (someone) aware of (something impending); especially:
警告或告诫(某人)避免不明智或不可接受的行为
To caution or admonish (someone) against unwise or unacceptable behaviour.
建议或命令离开或远离
To advise or order to go or stay away.
发出警告
To give warning.
warn
Base
原形
warns
3rd person
第三人称单数
warning
-ing
现在分词
warned
Past
过去式
warned
Past participle
过去分词
I warn you.
我警告你。
规则动词，过去式加-ed。
The sign warns drivers about the sharp curve ahead.
这个标志警告司机注意前方的急弯。
I warned my brother not to touch the hot pan.
我警告弟弟不要碰那个热锅。
The weather forecast warned that a storm was coming.
天气预报警告说暴风雨即将来临。
The police warned the public about the dangerous criminal.
警方警告公众注意危险罪犯。
I warned him to be careful.
我提醒他要小心。
The doctor warned the patient against smoking.
医生警告病人不要吸烟。
They warned us that the bridge was unsafe.
他们警告我们这座桥不安全。
Not this
I warned him don't go there.
Use this
I warned him not to go there.
错误：warn sb 后接否定不定式时，中文习惯直译为“警告不要”，但英语必须用 not to do 结构，而非 don't。
Not this
He warned me for the danger.
Use this
He warned me about the danger.
错误：warn sb 后接危险时，正确介词是 about/against/of，而非 for。for 常用于表示目的或原因，不适用于警告危险。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
警告关于（某事）
The doctor warned about the risks of smoking.
医生警告了吸烟的风险。
警告不要（做某事）
She warned against going out alone at night.
她警告不要在夜晚独自外出。
警告有（危险等）
The sign warns of falling rocks.
这个标志警告有落石。
警告某人
I warned him not to touch the wire.
我警告他不要碰那根电线。
警告某人离开；劝某人不要做某事
The police warned the teenagers off the abandoned building.
警察警告那些青少年不要靠近废弃的建筑。
凡事预则立；有备无患
I read the travel advisories before my trip - forewarned is forearmed.
我在旅行前阅读了旅行建议——有备无患。
我警告过你，但你没听。
The Joker says this to Batman in the 2008 film The Dark Knight, during their confrontation in the interrogation room.
这是2008年电影《黑暗骑士》中小丑在审讯室与蝙蝠侠对峙时说的话。
我警告过你，我是个可怕的人。
Lyrics from the 1994 hip-hop song 'Warning' by The Notorious B.I.G., where he asserts his dangerous nature.
出自1994年说唱歌曲《Warning》（Notorious B.I.G.），他在其中宣称自己的危险性。
Use warn naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
将warn拆解为war（战争）+n，提醒战争危险，发出警告。
动词'warn'多用于警告危险或提醒注意，常见于日常对话、正式通知等场合。语境包括个人提醒（如警告某人注意交通）和官方通告（如警示标志）。注册通常为中性，正式和非正式场合均可使用。
These words rhyme with 'warn' (/wɒ:n/) because they share the same vowel and final consonant sound. Beware of lookalikes like 'warm' (/wɔːm/), which sounds different due to the final /m/.
Dictionary facts from ECDICT, WIKTIONARY.