when,while,as引導(dǎo)時間狀語從句的區(qū)別.ppt

1、When，while，as引導(dǎo)時間狀語子句的差異，when，while，as顯然可以引導(dǎo)時間狀語子句，但使用差異很大。首先，when可以和連續(xù)性動詞一起使用，也可以和臨時動詞一起使用。While和as只能與連續(xù)性動詞一起使用。why do you want a new job when youve got such a good one already？(get是一個臨時動詞。)你已經(jīng)找到了這么好的工作，為什么還想找新的呢？why do you want a new job when youve got such a good one already？(get是一個臨時動詞。)你已經(jīng)找到了這么

2、好的工作，為什么還想找新的呢？the students took notes as they listened(listen是持續(xù)動詞)學(xué)生一邊上課一邊做筆記。2，when子句中的謂語動詞可以在主謂語句動作之前、之后或同時發(fā)生。While和as子句的謂詞行為必須與主句謂詞行為同時發(fā)生。1節(jié)動作發(fā)生在周節(jié)動作之前，只使用when。When he had finished his homework，he took a short rest (finished先發(fā)生)他做完作業(yè)后，他休息了一會兒。When I got to the airport，the guests had left (got t

3、o后發(fā)生)我到達(dá)機(jī)場的時候，客人們已經(jīng)離開了。2子句動作和主句動作同時發(fā)生，如果從句動作是連續(xù)動詞，則可以同時使用when、while、as。When While As we were dancing，a stranger came in (dance是連續(xù)性動詞)我們跳舞的時候，陌生人進(jìn)來了。when while as she was making a phone call，I was writing a letter (make是連續(xù)性動詞)她打電話的時候，我在寫信。3周文章，如果子句動作同時進(jìn)行，子句動作的時間概念就會模糊，主要用于表示發(fā)生主文章動作的背景或條件時，只能使用as。在牙齒點

4、，as通常表示“跟隨”。意思是“一方，一方”。As the time went on，the weather got worse(as的意思是“跟隨”)，the atmosphere gets thinner and thinner As the height increases隨高度的增加而增加The little girls sang as they went女孩們邊走邊唱。4在未來開球中經(jīng)常使用when，鐘鼓要用一般時間代替未來時間。when the manager comes here for a visit next week，Ill talk with him about this下周經(jīng)理訪問這里的時候，我會和他談?wù)勓例X的事。3，when用于表示“一個”的文章模式(參見過去的日子)。sb had hardly/scarcely done sth when hardly scarcely had sb done sth when，我閉上眼睛的時候有人在敲門。I had hardly scarcely closed my eyes when some one knocked at the do