prevent…from…和protect…from…和keep…from…和stop…from…的区别prevent…from…和protect…from…和keep…from…和stop…from…的区别preventsbfromdoingsth与stopsbfromdoingsth用法相同,在主动语态中from可以省略,被动语态中不行。keepsbfromdoingsth中的from无论在主动语态中还是在被动语态中都不能省略。如果省略就会变成keepsbdoingsth(使某人一直做某事)protec...