1,表时间的介词：at,before,after,since,still,until,upon,on,from,between,by,in,during,for,through,

　　within,over

　　2,表地点的：at,form,between,near,besid,by,closeto,nextto,behind,infrontof,

　　aheadof,before,arong,beyond,past

　　3,表工具或媒介：bythemeansof,with,through

　　4,表内容：over,of,asfor,with,dueto

　　6,表原因：for,becauseof,asaresultof,owingto,onacconutof,dueto