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as與which引導(dǎo)定語(yǔ)從句時(shí)到底有哪些區(qū)別

■山東  劉永科

有網(wǎng)友在“答疑中心”問(wèn)：關(guān)系代詞as與which引導(dǎo)定語(yǔ)從句時(shí)有哪些區(qū)別（問(wèn)題見(jiàn):m.52ysedu.com/GuestBook/Guest_Reply.asp?TopicID=1503）

現(xiàn)特約請(qǐng)本站顧問(wèn)及特約撰稿專家劉永科老師解答如下：

關(guān)系代詞as與which引導(dǎo)的非限制性定語(yǔ)從句，其先行詞都可以是整個(gè)主句，指代主句的整個(gè)意思。但as和which具有不同的詞義、句法和用法。

1. as引導(dǎo)的從句表示說(shuō)話人的看法、態(tài)度、解釋或評(píng)論

引導(dǎo)定語(yǔ)從句時(shí)，as仍具有“正如，像，由……可知”等意思，翻譯時(shí)有時(shí)可不必譯出。as定語(yǔ)從句常含有這些動(dòng)詞：see, know, hear, watch, remember, say, tell, show, expect, guess等，這類動(dòng)詞與as連用幾乎成了一種固定搭配。as引導(dǎo)的此類從句可以置于句首、句中或句尾。如：

The famous magician Liu Qian, as we all know, is from Taiwan. 眾所周知，著名魔術(shù)師劉謙是臺(tái)灣人。

There is a net bar around here, as I remember. 我記得這兒附近有一家網(wǎng)吧。

As is often the case, girls like dolls while boys like guns. 女孩子喜歡玩具而男孩子喜歡槍，這是常見(jiàn)的情況。

2. which引導(dǎo)的從句對(duì)主句所敘述的事情進(jìn)行補(bǔ)充說(shuō)明，表明事物的狀態(tài)或結(jié)果

which此時(shí)指前面主句所提到的這件事，常譯為“這一點(diǎn)，這件事”等。這時(shí)它所引導(dǎo)的從句與主句之間常含有并列、因果關(guān)系。注意，它引導(dǎo)的從句不像as那樣位置靈活，它只能位于主句的后面。如：

He changed his mind again, which made us all angry. 他又改變了主意，這使我們大家都生氣了。

She tore up my photos, which (=and that) upset me.她撕碎了我的照片，這使我很不安。

3. 在從句中作定語(yǔ)或介詞的賓語(yǔ)時(shí)，要用which，不用as

Jenny might come, in which case I'll ask her. 詹妮可能會(huì)來(lái)，要是那樣的話我就去問(wèn)她。

She graduated from a local middle school, after which she went to Beijing University. 她畢業(yè)于當(dāng)?shù)氐囊凰�中學(xué)，之后她去了北京大學(xué)。

4. 當(dāng)從句的謂語(yǔ)動(dòng)詞是否定形式或含著一個(gè)復(fù)合賓語(yǔ)時(shí)，一般用which而不用as

He pretended not to know me, which I didn't understand. 他假裝不認(rèn)識(shí)我，這是我搞不明白的。

He admires everyone in his class, which I find quite strange. 他羨慕班里的每個(gè)學(xué)生，我認(rèn)為太奇怪了。

【特別說(shuō)明】

as引導(dǎo)非限制性定語(yǔ)從句的最大特點(diǎn)是位置靈活；其次，as有以下常見(jiàn)的，而which不具備的“固定表達(dá)”：

as we all know 眾所周知    

as I can remember 正如我所記得的

as often happens 正如經(jīng)常發(fā)生的那樣     

as we expect 正如我們預(yù)料的那樣

as you see 這一點(diǎn)你明白

as was expected 正如預(yù)料的那樣

as can be seen 看得出來(lái)     

as may be imagined 正如可以想象的那樣

as has been said above 如上所述

as we all can see 正如我們都能看到的那樣

as is often the case 像常規(guī)那樣

as everybody can do 正如人人都能做到的那樣