the same...as...表示"與……同樣的",不是同一個 the same...that..表示"同一個",就是那個 例如：This is the same pen as I lost last week.這同我上周丟失的那支鋼筆一樣.(但不是同一支) This is the same pen that I lost last week.這就是我上周丟失的那支鋼筆.the same后面可以接定語從句,如果后面的定語從句是省略的情況,則用as來引導,即the same...as； 如果是完整的定語從句,須根據(jù)不同的先行詞來確定用 that,when,where,when,who等.例如:He studies in the same school as I.他和我在同一所學校里上學.He was born in the same hospital where my brother was born.他和我哥哥在同一家醫(yī)院里出生.The young teacher is the same man who visited our school last year.那個青年教師就是去年來我校參觀的那個人.
關于定于從句,我們對that/which/who/ whose/when /where.等引導詞引導的都比較熟悉,而as則有些模糊.下面我就詳細得把as定語從句的用法及其與其他定語從句的區(qū)別說一下.
"As”可以用作關系代詞引導定語從句.
一：as可以代替整個句子或一件事,引導非限制性定語從句,在從句中作主語、賓語或表語,意為“正如……,就像……,據(jù)……”；從句位置可置于主句之前或之后,有時也可作為插入語置于句中,一般用逗號和主句隔開.
as的這種用法常見于以下這些結構:as we can see,as can be seen,as we know,as is（well） known,as may be imagined,as often happens,as has been said before,as was mentioned above,as is often the case,as/indeed it is,etc.
多看一些例句:As is well known,great changes have taken place in China.or:Great changes,as is well known,have taken place in China.眾所周知,中國發(fā)生了巨大的變化.( as在定語從句中作主語.)
This experiment is very simple,as indeed it is.實驗非常簡單,事實上也確實如此.(as在定語從句中作表語.)
注意：① which在引導非限制性定語從句時,也有和as一樣的功能,可以代替整個句子,但which只能用在主句之后.
②在as所引導的非限制性定語從句中,如果運用的是被動語態(tài)結構,be動詞可以省略；但which沒有此用法,be動詞不可省.例如:She married him,which was unexpected.＝She married him as（was） unexpected.她嫁給了她,這一點大家都沒有料到.（作主語,代替前面的句子；用which時was不可省.）
二 as除了代替整個句子,也可以代替主句中一個特定的詞.as在它引導的定語從句（限制性或非限制性）中可以充當主語,賓語和表語；在這種用法中它經(jīng)常和such,so,the same等詞搭配使用；且當先行詞中有such,so,the same等詞修飾時,關系代詞通常必須用as.
例如:1.They were satisfied with this decision,as was agreed beforehand.他們對這個決定都滿意,這事先已經(jīng)經(jīng)過他們同意了.( as在定語從句中作主語,其先行詞是this decision)
2.I never heard such stories as he tells.我從未聽過他講的這類故事.( as在定語從句中作賓語,先行詞是such stories.)
3.The place doesn't look the same as it was before liberation.這個地方看上一去和解放前大不一樣了.( as在定語從句中作表語,先行詞是same)
4.Have you bought the same book as I referred to yesterday?你有沒有買我昨天說的那本書啊?( as在定語從句中作賓語,先行詞是book)
注意:先行詞中有the same修飾時,定語從句也可用that引導,但意思上有區(qū)別,as表示與此同類； that表示就是那一個,同物.
例如:Have you brought the same book that I gave you yesterday?
你有沒有把我昨天給你的那本書帶來啊?( that在定語從句中作賓語,先行詞是book.體會：本句中所指的書是同一本,上句中指的是同一類書,而并不就是那一本.)