英語作文的輸出需要大量的積累、不斷的練習,一些英語寫作方法還是應該多加注意。以下是小編整理的關于英語寫作方法·When,While,As的區(qū)別的資料,希望對你有所幫助!
雖然when,while,as都可以引導時間狀語從句,但是他們的用法區(qū)別還是很大的,下面是關于When,While,As引導時間狀語從句的區(qū)別,供學生參考!
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 you've got such a good one already?(get為短暫性動詞)你已經找到如此好的工作,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)當我趕到飛機場時,客人們已經離開了。
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)當我們跳舞時,一位陌生人走了進來。
②When /While /As she was making a phone call,I was writing a letter.(make為延續(xù)性動詞)當她在打電話時,我正在寫信。
3.當主句、從句動作同時進行,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 comes here for a visit next week,Ill talk with him about this.下周,經理來這參觀時,我會和他談談此事。
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.我剛一走進房門,電話就響了。
When\while\as的區(qū)別
①when是at or during the time that, 既指時間點,也可指一段時間;
while是during the time that,只指一段時間,因此when引導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 則強調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引導的時間狀語從句,主句用過去進行時,從句應用一般過去時;如果從句和主句的動作同時發(fā)生,兩句都用過去進行時的時候,多用while引導,如:
a. When the teacher came in, we were talking.
當此句改變主從句的位置時,則為:
While we were talking, the teacher came in. b. They 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”,表對照關系。如:
a. The children were running to move the bag of rice when they heard the sound of a motor bike.
孩子們正要跑過去搬開那袋米,這時他們聽到了摩托車的聲音。
b. He is strong while his brother is weak.
他長得很結實,而他弟弟卻很瘦弱。