英語(yǔ)時(shí)間狀語(yǔ)從句講解與練習(xí) 引導(dǎo)時(shí)間狀語(yǔ)從句的普通類從屬連詞有when（當(dāng)……時(shí)），while（在……期間），as（當(dāng)……，一邊……一邊……），before（在……之前），after（在……之后），since（從……以來(lái)），till/until（直到），whenever（無(wú)論何時(shí)），as soon as（一……就）等。如： When I went into the classroom, he was reading. 當(dāng)我走進(jìn)教室時(shí)，他正在看書。 He read a newspaper as he went along. 他邊走邊看報(bào)紙。We must strike while the iron is hot. 我們必須趁熱打鐵。I will tell you after they leave. 等他們走后我再告訴你。I told him to come back whenever he wants to. 我告訴他什么時(shí)候想回來(lái)就回來(lái)。 I waited till/until she was back. 我一直等到她回來(lái)。Once time is gone, you will never get it back. 時(shí)間一旦失去就再也得不到了注意：在時(shí)間狀語(yǔ)從句中，不能用一般將來(lái)時(shí)、過(guò)去將來(lái)時(shí)態(tài)或?qū)?lái)完成時(shí)，而要用相應(yīng)的一般現(xiàn)在時(shí)態(tài)、一般過(guò)去時(shí)或現(xiàn)在完成時(shí)來(lái)代替。如：I’ll telephone you as soon as I get there. 我一到達(dá)那里就打電話給你。She said she would phone me as soon as she got there. 她說(shuō)她一到達(dá)那里就給我電話。Don’t get off the bus until it has stopped. 等車停穩(wěn)后才下車。when, while 和 as 引導(dǎo)時(shí)間狀語(yǔ)從句的用法這三個(gè)詞的意思很簡(jiǎn)單，都有“當(dāng)……時(shí)候”的意思。但學(xué)生經(jīng)常會(huì)問(wèn)三個(gè)詞的區(qū)別在哪兒，特別是在做選擇題的時(shí)候。別說(shuō)是學(xué)生，就我個(gè)人而言，做這樣的選擇題要保證百分之百的正確也是不可能的。現(xiàn)根據(jù)大量的實(shí)例和個(gè)人的思考，做一點(diǎn)小結(jié)，供大家參考。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。1. 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。2. 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。3. Were you writing when the teacher came in? 老師進(jìn)來(lái)的時(shí)候，你在寫信嗎？4. 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。5. He was on the point of leaving when someone knocked at the door.他正要走，這時(shí)有人敲門。6. 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。7. I had hardly[scarcely] 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：1. 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(kāi)了。2. When he had finished his homework, he took a short rest.1/10當(dāng)他完成作業(yè)后，他休息了一會(huì)兒。3. 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？4. You shall borro