非限定性定語(yǔ)從句as

　　導(dǎo)語(yǔ)：非限定性定語(yǔ)從句，非限定性定語(yǔ)從句的作用是對(duì)所修飾的成分作進(jìn)一步說明，通常和主句間用逗號(hào)隔開，將從句拿掉后其他部分仍可成立。下面是小編給大家整理的非限定性定語(yǔ)從句as的相關(guān)內(nèi)容，希望能給你帶來(lái)幫助!

　　（一）非限定性定語(yǔ)從句as引導(dǎo)

　　as引出非限定性定語(yǔ)從句時(shí)，代替整個(gè)主句，對(duì)其進(jìn)行說明但通常用于像as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在非限定性定語(yǔ)從句中作主語(yǔ)、表語(yǔ)或賓語(yǔ)，且引出的從句位置比較靈活，可位于句首或句末，也可置于主句中間。通常均由逗號(hào)將其與主句隔開。as有“正如……， 就像……”之意。

　　如：As is known to the United States, Mark Twain is a great American writer.

　　美國(guó)人都知道，馬克·吐溫是一位偉大的美國(guó)作家。（as在從句中作主語(yǔ)）

　　He forgot to bring his pen with him, as was often the case.

　　他忘了帶筆，這是常事。（as在從句中作主語(yǔ)）

　　He is absorbed in work, as he often was.

　　他正在全神貫注地工作，他過去經(jīng)常這樣。（as在從句中作表語(yǔ)）

　　As we all know, the earth is round.

　　眾所周知，地球是圓的.。（as在從句中作賓語(yǔ)）

　　The two brothers were satisfied with this decision，as was agreed beforehand.

　　兩兄弟對(duì)此決定都滿意，這項(xiàng)決定在事前都已得到他們的同意。(as在從句中作主語(yǔ))

　　Taiwan is，as you know，an inseparable part of China.

　　你知道，臺(tái)灣是中國(guó)不可分割的一部分。(as在從句中作賓語(yǔ))

　　“介詞+關(guān)系代詞”引導(dǎo)非限制性定語(yǔ)從句：在介詞后引導(dǎo)非限制性定語(yǔ)從句。

　　難：句意相同

　　as it is known to all (that...) (as 做狀語(yǔ)從句連詞，是狀語(yǔ)從句, 可以加that)

　　與 as is known to all (as做主語(yǔ)，是定語(yǔ)從句)

　　與 it is known to all that... (主語(yǔ)從句，it是形式主語(yǔ))

　　即：As is widely known, the moon is closer to the us than the sun.(定從)

　　= That the moon is closer to the us than the sun is widely known.(主從)

　　= It is widely known that the moon is closer to the us than the sun.(主從)

　　As it is known to everyone, I thought you knew about it too.(狀從)[1]

　　關(guān)系代詞which有時(shí)并不代表主句中某一確定的詞，而是概括整個(gè)主句的意思。介詞的選擇取決于它與先行詞的搭配或與從句中謂語(yǔ)動(dòng)詞的搭配。

　　They were short of sticks to make frames for the climbing vines，without which the yield would be halved.

　　他們?nèi)贝钇咸鸭艿臈U兒，沒有它們產(chǎn)量會(huì)減少一半。

　　They thanked Tom，without whose support they would not have succeeded.

　　他們很感激Tom，沒有他的支持他們是不會(huì)成功的。

　　（二）as, which 非限定性定語(yǔ)從句

　　由as, which 引導(dǎo)的非限定性定語(yǔ)從句，as和which可代整個(gè)主句，相當(dāng)于and this或and that，as, which 非限定性定語(yǔ)從句。As一般放在句首，which在句中。

　　As we know, smoking is harmful to one's health.

　　The sun heats the earth, which is very important to us.

　　典型例題

　　1）Alice received an invitation from her boss, ___came as a surprise.

　　A. it B. that C. which D. he

　　答案C. 此為非限定性從句，不能用 that修飾，而用which.，it 和he 都使后句成為句子，兩個(gè)獨(dú)立的句子不能單以逗號(hào)連接。況且選he句意不通。

　　2）The weather turned out to be very good, ___ was more than we could expect.

　　A. what B. which C. that D. it

　　答案B。which可代替句子，用于非限定性定語(yǔ)從句，而what不可。That 不能用于非限定性定語(yǔ)從句，it不為連詞，使由逗號(hào)連接的兩個(gè)句子并在一起在英語(yǔ)語(yǔ)法上行不通，英語(yǔ)語(yǔ)法《as, which 非限定性定語(yǔ)從句》。

　　3）It rained hard yesterday, ____ prevented me from going to the park..

　　A. that B. which C. as D. it

　　答案B.

　　as 和which在引導(dǎo)非限制性定語(yǔ)從句時(shí)，這兩個(gè)關(guān)系代詞都指主句所表達(dá)的整個(gè)意思，且在定語(yǔ)從句中都可以作主語(yǔ)和賓語(yǔ)。但不同之處主要有兩點(diǎn)：

　　(1） as 引導(dǎo)的定語(yǔ)從句可置于句首，而which不可。

　　(2） as 代表前面的整個(gè)主句并在從句中作主語(yǔ)時(shí)，從句中的謂語(yǔ)必須是系動(dòng)詞；若為行為動(dòng)詞，則從句中的關(guān)系代詞只能用which.。

　　在本題中，prevent由于是行為動(dòng)詞，所以正確選項(xiàng)應(yīng)為B。

　　As 的用法

　　例1. the same… as；such…as 中的as 是一種固定結(jié)構(gòu), 和……一樣……。

　　I have got into the same trouble as he (has).

　　例2. as可引導(dǎo)非限制性從句，常帶有'正如'。

　　As we know, smoking is harmful to one's health.

　　As is know, smoking is harmful to one's health.

　　As是關(guān)系代詞。例1中的as作know的賓語(yǔ)；例2中，它充當(dāng)從句的主語(yǔ)，謂語(yǔ)動(dòng)詞know要用被動(dòng)式。

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