i warn him
我警告他
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I warn him of the danger.
我警告过他说有危险。
youdao
I tried to warn him, but he wouldn't listen.
我设法提醒过他，可他就是不听。
《牛津词典》
I did warn him!
我真的警告过他了！
And when I spoke, I did warn him, the Vice President, of the danger of things getting off track.
FORBES: Ferguson on Better Research, Addressing Causes of Aggression and Mental Illness and Being Involved with Children's Video Game Content
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