【正文】 第一篇：when和while的區(qū)別when和while的區(qū)別①when是at or during the time that, 既指時間點(diǎn)，也可指一段時間；while是during the time that，只指一段時間，因此when引導(dǎo)的時間狀語從句中的動詞可以是終止性動詞，也可以是延續(xù)性動詞，而while從句中的動詞必須是延續(xù)性動詞。②when 說明從句的動作和主句的動作可以是同時，也可以是先后發(fā)生；while 則強(qiáng)調(diào)主句的動作在從句動作的發(fā)生的過程中或主從句兩個動作同時發(fā)生。③由when引導(dǎo)的時間狀語從句，主句用過去進(jìn)行時，從句應(yīng)用一般過去時；如果從句和主句的動作同時發(fā)生，兩句都用過去進(jìn)行時的時候，多用while引導(dǎo)，如： the teacher came in, we were ，則為：While we were talking, the teacher came were singing while we were dancing.④when和while 還可作并列連詞。when表示“在那時”；while表示“而，卻”，表對照關(guān)系。如： children were running to move the bag of rice when they heard the sound of a motor ，這時他們聽到了摩托車的聲音。 is strong while his brother is ，而他弟弟卻很瘦弱。具體你可以參考這一段。when，while，as引導(dǎo)時間狀語從句的區(qū)別when，while，as顯然都可以引導(dǎo)時間狀語從句，但用法區(qū)別非常大。一、when可以和延續(xù)性動詞連用，也可以和短暫性動詞連用；而while和as只能和延續(xù)性動詞連用。① Why do you want a new job when youve got such a good one already？（get為短暫性動詞）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為短暫性動詞）對不起，你打電話時我剛好外出了。③Strike while the iron is hot．（is為延續(xù)性動詞，表示一種持續(xù)的狀態(tài)）趁熱打鐵。④ The students took notes as they listened．（listen為延續(xù)性動詞）學(xué)生們邊聽課邊做筆記。二、when從句的謂語動詞可以在主句謂語動作之前、之后或同時發(fā)生；while和as從句的謂語動作必須是和主句謂語動作同時發(fā)生。1．從句動作在主句動作前發(fā)生，只用 when。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，他休息了一會兒。②When I got to the airport，the guests had left．（got to后發(fā)生）當(dāng)我趕到飛機(jī)場時，客人們已經(jīng)離開了。2．從句動作和主句動作同時發(fā)生，且從句動作為延續(xù)性動詞時，when，while，as都可使用。①When ／While ／As we were dancing，a stranger came in．（dance為延續(xù)性動詞）當(dāng)我們跳舞時，一位陌生人走了進(jìn)來。②When ／While ／As she was making a phonecall，I was writing a letter．（make為延續(xù)性動詞）當(dāng)她在打電話時，我正在寫信。3．當(dāng)主句、從句動作同時進(jìn)行，從句動作的時間概念淡化，而主要表示主句動作發(fā)生的背景或條件時，只能用 as。這時，as常表示“隨著??”；“一邊??，一邊??”之意。① As the time went on，the weather got worse．（as表示“隨著??”之意）② The atmosphere gets thinner and thinner as the height increases．隨著高度的增加，大氣越來越稀薄。③As years go by，China is getting stronger and richer．隨著時間一年一年過去，中國變得越來越富強(qiáng)了。④The little girls sang as they went．小姑娘們一邊走，一邊唱。⑤The sad mother sat on the roadside，shouting as she was crying．傷心的媽媽坐在路邊，邊哭邊叫。4．在將來時從句中，常用when，且從句須用一般時代替將來時。①You shall borrow the book when I have finished reading it．在我讀完這本書后，你可以借閱。②When the manager es here for a visit next week，Ill talk with him about this．下周，經(jīng)理來這參觀時，我會和他談?wù)劥耸?。三、when用于表示“一??就??”的句型中（指過去的事情）。sb．had hardly（＝scarcely）done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．．①I 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，就有人在敲門了。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，電話就響了。while和when都是表示同時，到底句子中是用when還是while主要看從句和主句中所使用的動詞是短暫性動作（瞬時動詞）還是持續(xù)性動作。若主句表示的是一個短暫性的動作，而從句表示的是一個持續(xù)性動作時，兩者都可用。如：He fell asleep when [while] he was 。I met him when [while] I was taking a walk in the 。若主、從句表示兩個同時進(jìn)行的持續(xù)性動作，且強(qiáng)調(diào)主句表示的動作延續(xù)到從句所指的整個時間，通常要用 while。如：Don’t talk while you’re 。I kept silent while he was ，我默不作聲。若從句是一個短暫性動作，而主句是一個持續(xù)性動作，可以 when 但不用 while。如： When he came in, I was listening to the ，我在聽收音機(jī)。It was raining hard when we 。若主、從句表示的是兩個同時(或幾乎同時)發(fā)生的短暫性動作，一般要用 when。如： I thought of it just when you opened your ，我也想到了。至于什么是短暫性動作，什么是持續(xù)性動作，其實(shí)有個很簡單的規(guī)律。就是如果是進(jìn)行時態(tài)，一般是持續(xù)性的。如果是過去式，一般是短暫性動作。對于，填寫when還是while的問題，通常首先看主句和從句中的時態(tài)，再根據(jù)以上4個規(guī)律來判斷填寫那個單詞。兩者的區(qū)別如下：①when是at or during the time that, 既指時間點(diǎn)，也可指一段時間； while是during the time that，只指一段時間，因此when引導(dǎo)的時間狀語從句中的動詞可以是終止性動詞，也可以是延續(xù)性動詞，而while從句中的動詞必須是延續(xù)性動詞。②when 說明從句的動作和主句的動作可以是同時，也可以是先后發(fā)生；while 則強(qiáng)調(diào)主句的動作在從句動作的發(fā)生的過程中或主從句兩個動作同時發(fā)生。③由when引導(dǎo)的時間狀語從句，主句用過去進(jìn)行時，從句應(yīng)用一般過去時；如果從句和主句的動作同時發(fā)生，兩句都用過去進(jìn)行時的時候，多用while引導(dǎo)，如： the teacher came in, we were ，則為：While we were talking, the teacher came were singing while we were dancing.④when和while 還可作并列連詞。when表示“在那時”；while表示“而，卻”，表對照關(guān)系。如： children were running to move the bag of rice when they heard the sound of a motor ，這時他們聽到了摩托車的聲音。 is strong while his brother is ，而他弟弟卻很瘦弱。when。while 當(dāng)??時候while能用when代替。+從句, 動作一定會延續(xù)when+延續(xù)性動詞/瞬間動詞。when he arrived when he died when,while強(qiáng)調(diào)動作同時發(fā)生 過去進(jìn)行時 :在過去的某一點(diǎn)時間, 或者是過去某一動作同時發(fā)生的另外一個動作 瞬間動詞(arrive)無進(jìn)行時態(tài) I am arriving 進(jìn)行時態(tài)表示將要 When he arrived,I was having , 均用過去進(jìn)行時When I was doing my homework,my mother was my mother was doing the housework,my father was watching , 另一個用過去進(jìn)行時 , 均用過去進(jìn)行時When the plane arrived,...were waiting inside the main building while others were waiting on...While......were keeping guard at the door,two others opened the , 兩個動作同時發(fā)生, 不是同時開始同時結(jié)束, 延續(xù)時間不一致, 長一點(diǎn)時間的動作用進(jìn)行時態(tài), someone knocked at the door,I was having 。所