介词加which的用法

1）介词与先行词的习惯搭配Thereisnowayinwhichitcouldbebroughtbacktotheearth．（SEFC2AL．55）（in与way是习惯搭配）2）介词与定语从句中的动词，形容词的习惯搭配Thesearethewireswithwhichdifferentmachinesareconnected．（beconnectedwith是习惯搭配）Theauthorwithwhomallofusarefamiliarwillvisitourcompa-ny．（befamiliarwith是习惯搭配）3）同形的先行词，或定语从句中的动词，形容词表示不同的含义时，要根据其含义选用不同的介词。Ican'tremembertheageatwhichhewontheprize．Thatistheageinwhichpeopleliveinpeaceandhappiness．age在前句中意为“年岁”，与at搭配；在后句中意为“时期”，与in搭配。4）复杂介词须保持其完整形式，常见的复杂介词有onthetopof，inthemiddleof，infrontof，inspiteof，atthebackof，becauseof等。Wetookaphotoofrocket，thelengthofwhichwasabout30me-tres．（SEFC2AL．55）Soundisatoolbymeansofwhichpeoplecommunicatewitheachother．Theymarchedthroughthesquare，inthemiddleofwhichstoodamonument．5）短语动词中的介词不可与动词分开提至关系代词前。常见的短语动词有listento，lookat，dependon，payattentionto，takecareof，lookinto，breakinto，getridof，takepartin，makeuseof，takeholdof，catchholdof，catchupwith，getalongwith，lookforwardto等。此时可用which，who，whom或that，也可将他们省略。（误）Thisisthegirlofwhomhewilltakecare．（正）Thisisthegirlwhomhewilltakecareof．6）当介词与定语从句中的动词或形容词联系紧密（但不是短语动词）时，介词也可放在动词或形容词的后面。但当介词与从句中的动词或形容词联系不紧密时，则需将介词置于关系代词前。比较：Thespacestationwhichwedrovetowasinthedesert．（SEFC2AL．55）I'llneverforgetthedayinwhichIjoinedtheParty．后句中若置于句尾则有“孤零零”之感，这时宜将介词置于关系代词前；而前句中的to则可后置。5．关系代词的选择用于介词后的关系代词只有which，whom，前者指物，后者指人。Therearemanyresearchstationsontheearthinwhichouterspaceisstudied．（SEFC2AL．55）（which指代researchstations）Wequestionedthepilot，fromwhomwelearntthatnootherplaneshadbeenseen．（SEFC2AL．55）（whom指代thepilot）