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warn sb. about sth.与warn sb. of sth.的区别他们等于warn sb. sth.吗若不等

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warn sb. about sth.与warn sb. of sth.的区别他们等于warn sb. sth.吗若不等于他们的区别与用法
warn sb.about sth.这里sth通常是一个名词,
如:He warned us about the serious situation.
warn sb.of sth.这里sth通常是一个从句.
He has been warned of danger of driving after drinking wine.
sth代表driving after drinking wine.
不等于.一般都加介词