warn的用法：“warn sb. of/about sth意思是“针对…而警告某人；“warn s
warn的用法：
“warn sb. of/about sth意思是“针对…而警告某人；“warn sb (not) to do sth意思是“告戒某人(不)要做某事；“warn sb. + that从句意思是“警告某人说……。如：Theywarnedthe passengersofthieves.(他警告路人小心窃贼)/ Iwarnyouthatyou will fail in the coming exams if you are still so lazy.(我警告你：如果你还这么懒在即将来到的考试中你会不及格的。)/ He waswarnednot to goout in the late night. (他受到警告不要在深夜出去)