at,on,by,then的区别是什么答:因此以前中文译作“前置词”,就是一种放在名词(或相当于名词的词语)前面的虚词。一、常用的介词about,above,across,after,against,around,at,before,behind,below,beneath,beside,besides,between,beyond,by,down,during,except,for,from,in,inside,into,like,near,of,off,on,out,outside,over,since,through,...