关系代词whom,which作从句中介词的宾语,介词一般提前,也可放在后面.但如果从句中的介词为谓语的动词短语,介词不能提前,需紧挨动词.

　　　Shesatonthecornerofthetablenearthedoorbywhichhehusbandalwaysentered.

　　　Shesatonthecornerofthetablenearthedoorwhichhehusbandalwaysenteredby.

　　　Thisisthekeywhichyouarelookingfor.

　　　但是先行词是时间,介词应放在关系代词which之前,不放在句尾.

　　　I'llneverforgetthedaywhichIfirstmetyouon.(Χ)

　　　如果whom,which为介词宾语被省略,介词不能提前.

　　　Ihavethebookyouaretalkingabout.

　　　Thegirlheleanedagainstwashissister.

　　介词短语提前

　　Hedescribeditas'averyagreeablesituationlocatedwithintwosmallhillsinthemidstofwhichflowedagreatriver关系代词whom,which作从句中介词的宾语,介词一般提前,也可放在后面.但如果从句中的介词为谓语的动词短语,介词不能提前,需紧挨动词.

　　　Shesatonthecornerofthetablenearthedoorbywhichhehusbandalwaysentered.

　　　Shesatonthecornerofthetablenearthedoorwhichhehusbandalwaysenteredby.

　　　Thisisthekeywhichyouarelookingfor.

　　　但是先行词是时间,介词应放在关系代词which之前,不放在句尾.

　　　I'llneverforgetthedaywhichIfirstmetyouon.(Χ)

　　　如果whom,which为介词宾语被省略,介词不能提前.

　　　Ihavethebookyouaretalkingabout.

　　　Thegirlheleanedagainstwashissister.

　　介词短语提前