to do sth
warn sb of sth 告诫某人某事
warn sb (not ) to do sth 告诫某人(别) 做什么
warn sb against doing sth 告诫某人别做什么
warn sb against sb / sth 告诫某人提防某人,某物
不懂追问
*^__^*
to do sth
warn sb of sth 告诫某人某事
warn sb (not ) to do sth 告诫某人(别) 做什么
warn sb against doing sth 告诫某人别做什么
warn sb against sb / sth 告诫某人提防某人,某物
不懂追问
*^__^*