“警告某人某事”常见的英文表达有 warn someone about something 或 warn someone of something。以下为你详细介绍：
含义：强调就某件事情向某人发出警告，提醒其注意相关情况或可能存在的风险。
例句：
The teacher warned the students about the dangers of playing near the river.（老师警告学生们在河边玩耍的危险。）
The government warned citizens about the upcoming severe weather.（政府警告市民即将到来的恶劣天气。）
含义：侧重于告知某人某事是一种潜在的危险、威胁或不利情况，让对方有所防备。
例句：
The doctor warned her of the possible side effects of the medication.（医生警告她这种药可能存在的副作用。）
We were warned of the slippery roads due to the rain.（我们被提醒由于下雨，道路会很滑。）