定語從句關於介詞提前麻煩哪位大師幫我把定語從句中介詞提前的部分講一下，最好細一點.（可以結合下麵的例句）October 1，1949 is the day. The People'；s Republic of China was founded on ；October 1，1949.---October 1，1949 is the day when（=on which）the People'；s Republic of China was founded. ；I'；ll never forget the time. We worked on the farm during the time.---I'；ll never forget the time when（=during which）we worked on the farm.I recently went to the town. I was born in the town.---I recently went to the town. where（=in which）I wasborn.Thereason why（=for which）he was late was that he missed his train.（能把這句話拆成兩句嗎？）；另外，who、whom、whose、when、where、why在定語從句中作為連接詞，那些、在做什麼成分時是可以省略的啊？

介詞+關係代詞”引導的定語從句
介詞加關係代詞引導的定語從句要注意以下幾點：
1.“介詞+關係代詞”引導的定語從句時，介詞的賓語只能用which（指物）和whom（指人），即：介詞+which/whom.不能用that和who.
e.g. This is the teacher from whom we’ve learned a lot.這就是從他那裡我們學了很多東西的老師.
Great changes have taken place in the city in which we live.我們所居住的都市發生了巨大的變化.
2.有時介詞也可放在從句的末尾，這時關係代詞可用which/that（指物），who/whom/that（指人），也可以省略.
e.g. The situation（which/that）we had got into was very dangerous.我們當時的處境很危險.
The man（whom/who/that）you were talking to just now is my English teacher.你剛剛和他談話的那個人是我的英語老師.
3.當定語從句中的謂語動詞短語是固定搭配，不可分割時，那麼動詞短語中的介詞不能前置.
e.g. This is the pen which I’m looking for.這是我正在找的那支鋼筆.
不能寫成：This is the pen for which I’m looking.
4.定語從句也可由“名詞/代詞/數詞+介詞+which/whom”引出.
e.g. That old man has two sons，one of whom is a doctor.那個老人有兩個兒子，其中一個是醫生.
The house，the windows of which（= whose windows = of which the windows）were damaged，has now been repaired.窗子遭破壞的那棟房子現在已經修好了.
5.引導定語從句的關係副詞（when，where，why）可以用“介詞+關係代詞”代替.
e.g. I’ll never forget the day when I joined the party.（when= on which）.我永遠都不會忘記入黨的日子.
The factory where my father works is in the east of the city.（where = in which）.父親工作的那家工廠在城東.
None of us know the reason why Tom was absent from the meeting.（why = for which）.我們都不知道湯姆缺席會議的原因.
6.“複合介詞短語+which”引導的定語從句，常與先行詞用逗號隔開，而且定語從句常用倒裝語序.
e.g. He lived in a big house，in front of which stood a big tall tree.他住在一幢大房子裏，房前有一棵大樹.

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