1、when，while引導(dǎo)時(shí)間狀語(yǔ)從句的區(qū)別如下：一、when可以和延續(xù)性動(dòng)詞連用，也可以和短暫性動(dòng)詞連用；而while只能和延續(xù)性動(dòng)詞連用。

2、 ① Why do you want a new job when youve got such a good one already？（get為短暫性動(dòng)詞）你已經(jīng)找到如此好的工作，為何還想再找新的？ ②Sorry，I was out when you called me．（call為短暫性動(dòng)詞）對(duì)不起，你打電話時(shí)我剛好外出了。

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3、 ③Strike while the iron is hot．（is為延續(xù)性動(dòng)詞，表示一種持續(xù)的狀態(tài)）趁熱打鐵。

4、 ④ The students took notes as they listened．（listen為延續(xù)性動(dòng)詞）學(xué)生們邊聽(tīng)課邊做筆記。

5、 二、when從句的謂語(yǔ)動(dòng)詞可以在主句謂語(yǔ)動(dòng)作之前、之后或同時(shí)發(fā)生；while從句的謂語(yǔ)動(dòng)作必須是和主句謂語(yǔ)動(dòng)作同時(shí)發(fā)生。

6、 1．從句動(dòng)作在主句動(dòng)作前發(fā)生，只用 when。

7、 ①When he had finished his homework，he took a short rest．（finished先發(fā)生）當(dāng)他完成作業(yè)后，他休息了一會(huì)兒。

8、 ②When I got to the airport，the guests had left．（got to后發(fā)生）當(dāng)我趕到飛機(jī)場(chǎng)時(shí)，客人們已經(jīng)離開(kāi)了。

9、 2．從句動(dòng)作和主句動(dòng)作同時(shí)發(fā)生，且從句動(dòng)作為延續(xù)性動(dòng)詞時(shí)，when，while都可使用。

10、 ①When ／While ／As we were dancing，a stranger came in．（dance為延續(xù)性動(dòng)詞）當(dāng)我們跳舞時(shí)，一位陌生人走了進(jìn)來(lái)。

11、 ②When ／While ／As she was making a phonecall，I was writing a letter．（make為延續(xù)性動(dòng)詞）當(dāng)她在打電話時(shí)，我正在寫(xiě)信。

12、 3．在將來(lái)時(shí)從句中，常用when，且從句須用一般時(shí)代替將來(lái)時(shí)。

13、 ①You shall borrow the book when I have finished reading it．在我讀完這本書(shū)后，你可以借閱。

14、 ②When 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)劥耸隆?/p>

15、 三、when用于表示“一……就……”的句型中（指過(guò)去的事情）。

16、 sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． ①I(mǎi) had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我剛一閉上眼，就有人在敲門(mén)了。

17、 ②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我剛一走進(jìn)房門(mén)，電話就響了。

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