题目内容：

prevent sb.doing sth.\stop sb.from doing sth\keep\protect有什么区别?

优质解答

prevent sb from doing sth与stop sb from doing sth用法相同,在主动语态中from可以省略,被动语态中不行.keep sb from doing sth中的from无论在主动语态中还是在被动语态中都不能省略.protect...from...表示“保护…...