易混點(diǎn)撥：when,_while和as引導(dǎo)時(shí)間狀語(yǔ)從句的用法.doc

易混點(diǎn)撥：when, while和as引導(dǎo)時(shí)間狀語(yǔ)從句的用法一、when的用法如果只從現(xiàn)象來(lái)看，when從句用的最多的是一般過(guò)去時(shí)，而主句的時(shí)態(tài)沒(méi)有限制，根據(jù)具體情況而定。When he was a child he was always trying out new ideas. 他小時(shí)候就常常試驗(yàn)一些新的設(shè)想。 when she came into my room I was just reading a book. 她走進(jìn)我房間時(shí)，我正在看書。Were you writing when the teacher came in? 老師進(jìn)來(lái)的時(shí)候，你在寫信嗎？ Sorry, I was out when you called me. 對(duì)不起，你打電話來(lái)的時(shí)候我出去了。He was on the point of leaving when someone knocked at the door. 他正要走,這時(shí)有人敲門。 I thought of it just when you opened your mouth.就在你要說(shuō)話的時(shí)候，我也想到了。I had hardlyscarcely closed my eyes when someone knocked at the door. 我剛一閉上眼，就有人在敲門了。 根據(jù)以上的例句，我們可以總結(jié)出一點(diǎn)：when從句的A事件，相當(dāng)于另一個(gè)事件B發(fā)生的時(shí)間點(diǎn)。也就是說(shuō)，when從句的重點(diǎn)不在動(dòng)作本身發(fā)生的狀態(tài)，而只是把它作為一個(gè)時(shí)間點(diǎn)，所以when多數(shù)情況下用的是一般過(guò)去時(shí)，則不用正在進(jìn)行時(shí)。因?yàn)槿绻谜谶M(jìn)行時(shí)，它表示的就是一段時(shí)間而不是一個(gè)時(shí)間點(diǎn)了。根據(jù)這一點(diǎn)，有的文章補(bǔ)充說(shuō)：when從句的動(dòng)詞大多是瞬時(shí)動(dòng)詞。這種說(shuō)法也可以參照。實(shí)際上，when從句也可以有其它的時(shí)態(tài)，但幾乎也不用進(jìn)行時(shí)，因?yàn)樗仓皇亲鳛橐粋€(gè)時(shí)間參照點(diǎn)。例如：When I got to the airport, the guests had left. 當(dāng)我趕到飛機(jī)場(chǎng)時(shí)，客人們已經(jīng)離開了。When he had finished his homework, he took a short rest.當(dāng)他完成作業(yè)后，他休息了一會(huì)兒。 Why do you want a new job when you have got such a good one already?你已經(jīng)找到如此好的工作，為何還想再找新的？You shall borrow the book when I have finished reading it. 在我讀完這本書后，你可以借閱。 When the manager comes here for a visit next week, Ill talk with him about this. 下周，經(jīng)理來(lái)這參觀時(shí)，我會(huì)和他談?wù)劥耸?。二、while 的用法相比于when來(lái)說(shuō)，while從句的側(cè)重點(diǎn)就不一樣了。while從句的側(cè)重點(diǎn)在于描述動(dòng)作正在發(fā)生的狀態(tài)，它的意思是：當(dāng)while事件正在發(fā)生的時(shí)候，另一件事如何如何。所以，while從句一般用的是正在進(jìn)行時(shí)。而另一件事的狀態(tài)沒(méi)有硬性的要求，根據(jù)具體情況而定。例如：While my wife was reading the newspaper, I was watching TV. 當(dāng)妻子正在看報(bào)紙的時(shí)候，我正在看電視。While Jim was mending his bike, Lin Tao came to see him. 正當(dāng)吉姆修自行車時(shí)，林濤來(lái)看他。While they were talking, the bell rang. 正在他們談話的時(shí)候，上課鈴響了。You cant do your homework while youre watching TV. 你不能一邊看電視一邊做家庭作業(yè)。 While John was sitting biting his nails, I was working out a plan to get us home. 約翰坐在那里咬指甲時(shí)，我想出了一個(gè)回家的辦法。 從時(shí)間的角度來(lái)看，while表示的是一段時(shí)間，是一個(gè)過(guò)程。這是while的側(cè)重點(diǎn)。因此，如果含有“一段時(shí)間”的含義的時(shí)候，就可以用while。例如：Strike while the iron is hot. 趁熱打鐵。這句話中，是說(shuō)趁著鐵是熱的這段時(shí)間，趕緊打鐵。如果換成when意思就變了，相當(dāng)于說(shuō)鐵只熱了一下，打一下，然后鐵就冷了。這顯然不符合文意。再例：Im going to the post office. While youre there, can you get me some stamps? 三、as 的用法1、as從句表示的也是一件事情正在發(fā)生，另一件事也正在進(jìn)行當(dāng)中。但與while從句不同的是，as從句用的一般不用正在進(jìn)行時(shí)，而只是一般過(guò)去時(shí)。as從句一般可以翻譯成“邊邊”。例如：As my mother sang those old songs, tears ran down her cheeks. 當(dāng)我媽媽唱起那些老歌時(shí)，眼淚順著她的臉頰流了下來(lái)。 The students took notes as they listened.學(xué)生們邊聽(tīng)課邊做筆記。As we talked on, he got more and more excited. 我們繼續(xù)往下談的時(shí)候，他越來(lái)越興奮。 The little girls sang as they went.小姑娘們一邊走，一邊唱。Just as he caught the ball, there was a tearing sound. 當(dāng)他抓住球的時(shí)候，有一種撕裂的聲音。 2、as表達(dá)的事件，往往只是主句動(dòng)作發(fā)生的背景或條件時(shí)，as只是一個(gè)次要的時(shí)間說(shuō)明，不像while從句有強(qiáng)調(diào)while動(dòng)作本身的意思。因此，as常常翻譯成“隨著”之意。 例如：As the time went on,the weather got worse. 隨著時(shí)間的推移，氣候更加糟糕。The atmosphere gets thinner and thinner as the height increases. 隨著高度的增加，大氣越來(lái)越稀薄。 As years go by, China is getting stronger and richer. 隨著時(shí)間一年一年過(guò)去，中國(guó)變得越來(lái)越富強(qiáng)了。 3、少數(shù)情況下，如果強(qiáng)調(diào)動(dòng)作正在發(fā)生，as從句也可以用正在進(jìn)行時(shí)。這只能算是特例了。The sad mother sat on the roadside, shouting as she was crying. 傷心的媽媽坐在路邊，邊哭邊叫。 As we was going out, it began to snow.當(dāng)我們出門時(shí)，開始下雪了。He came in as I was going to bed. 我正要上床睡覺(jué)，他進(jìn)來(lái)了。四、when, while, as 的互換如果從句動(dòng)作和主句動(dòng)作同時(shí)發(fā)生，并且從句動(dòng)作為延續(xù)性動(dòng)詞時(shí)，when, while, as可以互換使用。這種情況下，它們的細(xì)微區(qū)別恐怕連英、美人自己也說(shuō)不清了。When/While/As we were dancing, a stranger came in. 當(dāng)我們跳舞時(shí)，一位陌生人走了進(jìn)來(lái)。 dance為延續(xù)性動(dòng)詞When/While/As she was making a phone call, I was writing a letter.當(dāng)她在打電話時(shí)，我正在寫信。 make為延續(xù)性動(dòng)詞While/When/As I was walking down the street, I noticed a police car in front of the bank. 我順著馬路往前走時(shí)，發(fā)現(xiàn)銀行門前停著一輛警車。 【附】常用的表示時(shí)間的關(guān)聯(lián)詞常用關(guān)聯(lián)詞：when, as, while, as soon as, while, before, after, since , once, till, until等。特殊關(guān)聯(lián)詞：the minute, the moment, the second, every time, the day, the instant, immediately, directly, instantly, no sooner than, hardly when, scarcely when 等。例句：I didnt realize how special my mother was until I became an