復(fù)合句中as用法詳解

as的用法靈活，詞義繁多，特別是在復(fù)合句中更能體現(xiàn)其用法的多樣性和靈活性，但如果同學(xué)們能正確掌握as的詞性和詞義，是不難掌握其用法的。

一、as用作關(guān)系代詞引導(dǎo)定語(yǔ)從句

1.as引導(dǎo)非限制性定語(yǔ)從句，一般不指代某個(gè)具體的名詞或代詞，而是代表整個(gè)主句或主句的一部分。這種從句可放在主句之前，也可以放在主句之后，有時(shí)還可以放在主句的中間。如：As is reported in the newspapers,talks between the two countries are making progress.正如在報(bào)紙上所報(bào)道的，兩國(guó)間的談判有所進(jìn)展。Grammar is not a set of dead rules,as has been said above.如上所說，語(yǔ)法不是一套死條文。Spiders are not insects,as many people think,nor even nearly related to them.蜘蛛不是昆蟲，盡管許多人都這樣認(rèn)為，它甚至與昆蟲幾乎沒有聯(lián)系。2.as引導(dǎo)限制性定語(yǔ)從句，主要用于the same…as(與……相同)，such…as(像……一樣)，as…as(與……一樣)。如：(與She knew he felt just the same as she did.她知道他的感受和她一樣。Such a man with a good temper as Mr.Li is easy to get along with.像李先生這樣好脾氣的人是容易相處的。He smokes as expensive a cigarette as he can afford.他抽一種他買得起的最貴的煙。

二、as作為從屬連詞引導(dǎo)時(shí)間狀語(yǔ)從句

表示“當(dāng)……的時(shí)候”或“>一邊……一邊”，強(qiáng)調(diào)主句的動(dòng)作和從句的動(dòng)作同時(shí)發(fā)生。如：I saw him as he was getting off the bus.當(dāng)他下公共汽車的時(shí)候我看見了他。The boy was singing a popular song as he was bicycling.這男孩邊騎車邊唱歌。As she grew older,she became less active.當(dāng)她長(zhǎng)大一點(diǎn)的時(shí)候，就變得不那么活潑了。As she grew older,she became less active.

三、as作為從屬連詞引導(dǎo)原因狀語(yǔ)從句

as引導(dǎo)的原因狀語(yǔ)從句常放在主句前，表示“因?yàn)?，由?rdquo;。如：As she is a model teacher,she gives a good example to others.因?yàn)樗且幻７督處?，她給其他人樹立了一個(gè)好的典范。As he wasn’t ready in time,we went to the cinema without him.由于他沒有及時(shí)準(zhǔn)備好，我們就去看電影了，沒有等他。

四、as作為從屬連詞，引導(dǎo)讓步狀語(yǔ)從句

as引導(dǎo)讓步狀語(yǔ)從句比較特別，它要求將主語(yǔ)和謂語(yǔ)或謂語(yǔ)的一部分倒裝。如：Old as he is,he is still full of energy.盡管年紀(jì)大了，但他依然精力充沛。Try as she may,she never succeeds.盡管她很努力，但總是不成功。Try as she may,she never succeeds.Much as I admire Mr.Wang as a poet,I don’t like him as a man.盡管我喜歡王先生的詩(shī)歌，但我不喜歡他的為人。注：當(dāng)?shù)寡b后置于句首的名詞為單數(shù)可數(shù)名詞時(shí)，習(xí)慣上不帶冠詞。如：Boy as he was,he was made king.盡管他還是個(gè)孩子，卻被立為國(guó)王了。

五、與其他詞搭配使用構(gòu)成從屬連詞引導(dǎo)從句

1.as if/as though。表示“好像，仿佛”，引導(dǎo)表語(yǔ)從句或方式狀語(yǔ)從句。如：It looks as if/as though it is going to snow.看起來要下雪啦。He looks as if/as though he had seen a ghost.他的臉色看起來好像他看見了鬼。He talks as if/as though he knew everything about it.他說話的口氣好像他已經(jīng)全部都知道了。<it.about everything>

2.as[so]long as。“只要”，引導(dǎo)條件狀語(yǔ)從句。如：<it.about everything>As[So]long as you can keep away from them,you will be safe.只要你能遠(yuǎn)離他們，你就安全了。I’m happy as long as you are happy.只要你幸福，我就感到幸福了。I’m happy as long as you are happy.

3.as[so]far as。表示“在……的范圍內(nèi)”，引導(dǎo)限制狀語(yǔ)從句。多用于下列結(jié)構(gòu)：as[so]far as I know(據(jù)我所知)，as[so]far as I can see,as[so]far as I’m concerned(依我看)。如：(依我看)。如：As[So]far as I know,the couple have been abroad for about five years.據(jù)我所知，這對(duì)夫婦已經(jīng)出國(guó)約五年了。There’s only one thing to be done now,as far as I can see.依我看。現(xiàn)在只有一件事情要做。

4.as soon as。表示“一……就”，引導(dǎo)時(shí)間狀語(yǔ)從句。如：As soon as he got off the plane,he telephoned her girl friend.他一下飛機(jī)就給他的女朋友打了個(gè)電話。He started as soon as he received the news.他一得到消息就出發(fā)了。

總之，由于as的用法復(fù)雜，同學(xué)們?cè)趯W(xué)習(xí)時(shí)一定要注意比較其在不同句子中的作用，判斷其連接的是什么樣的從句，多做一些關(guān)于相關(guān)練習(xí)，這樣便可掌握其用法了。