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He married her, as(which)was natural.(1) as導的定語從句可以放在句首,而which則不能。As is known to us all, China is developing rapidly.(2) as表示“正如,正像”,而which無此意。此時,as從句中常有know, expect, happen, point out, plan, suggest等單詞或短語。He came back home late, as we expected.As is pointed out, this is a grammar problem.People generally agree that American English differs from British English a bit,as is said above.注意:as引導的定語從句常見句式有as is known to all, as is often the case, as is mentioned above, as is announced(3) 當先行詞被the same, such修飾時,定語從句需用as引導。It is such a difficult problem as none of us can work out.He wears the same coat as mine.注意:但是當先行詞被the same...as指同樣或同類的事物;the same...that指同一個事物。This is the same watch as I lost.(不是同一塊表) This is the same watch that I lost.(是同一塊表)(六)“介詞+關系代詞”結構(1)“介詞+關系代詞”可引導限制性定語從句,也可引導非限制性定語從句。One subject to which country music often returns is the good old days.We went to hear this famous singer, about whom we had heard many stories.(2)“介詞+關系代詞”結構中的介詞可以是in, on, about, from, for, through, with, to, at, against, without, by,of等。介詞放在關系代詞前,關系代詞只能用whom或which。There is a big window in my rom through which I can see the railway station.Old Harry is an ordinarylooking man,on the nose of whom is a pair of thick glasses.(3)介詞位于定語從句末尾時,可用that/which(指物),that/whom/who(指人)作從句中介詞的賓語。This is the house that Lu Xun once lived in.=This is the house in which Lu Xun once lived.He is the very person that the boss is looking for.=He is the very person for whom the boss is looking.(4)“介詞+關系代詞”結構可代替when, where, why, that等。但要注意介詞的位置變化以及相應的關系詞的變化。That is the college at which he works. which he works at. where he works. that he works at. he works at.(5)“介詞+關系代詞”結構在定語從句中可作狀語或定語,并可與別的名詞一起作狀語。The place at which the bridge is supposed to be built should be where the crossriver traffic is the heaviest.Don39。t get close to the house, the roof of which is under repaired.I39。ll go to Beijing, in which case I39。ll go to visit my aunt.(6)“介詞+關系代詞”在含有被動結構的定語從句中作狀語,表示動作的執(zhí)行者。The rascal by whom the little boy was beaten was arrested this morning.(7)“名詞、數(shù)次、介詞+關系代詞”的常見形式。名詞/one/two/some/none/all/both/several/many/most/a few/a little/the+比較級/the+最高級...+of which/