D warn sb of sth提醒、警告某人某事A项：warn sb. (not) to do sth. 提醒（警告）某人（不）做某事B项：warn sb. about / against sb. / sth. 或 warn sb. against doing sth.提醒某人／警告某人不要做某事。例：He warned us about the serious situation.他提醒我们形势的严峻。They warned him against swimming in that river.他们警告他不要到那个河里游泳。...
