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some stamps? 三、as 的用法 as 從句表示的也是一件事情正在發(fā)生,另一件事也正在進行當(dāng)中。as 從句一般可以翻譯成“邊……邊……”。 2. The students took notes as they listened. 學(xué)生們邊聽課邊做筆記。 4. The little girls sang as they went. 小姑娘們一邊走,一邊唱。 as 表達的事件,往往只是主句動作發(fā)生的背景或條件時,as 只是一個次要的時間說明,不像while 從句有強調(diào) while 動作本身的意思?! ±纾骸 ?. As the time went on,the weather got worse. 隨著時間的推移,氣候更加糟糕。 3. As 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。這只能算是特例了。 2. As we were going out, it began to snow. 正當(dāng)我們出門時,雪開始下起來。四、when, while, as 的互換 如果從句動作和主句動作同時發(fā)生,并且從句動作為延續(xù)性動詞時,when,while,as 可以互換使用。 [dance 為延續(xù)性動詞] 2. When /While /As she was making a phone call, I was writing a letter. 當(dāng)她在打電話時,我正在寫信。五、比較while, when, as 1)as, when 引導(dǎo)短暫性動作的動詞。 2)當(dāng)從句的動作發(fā)生于主句動作之前,只能用when 引導(dǎo)這個從句,不可用as 或 while。 3)從句表示“隨時間推移”連詞能用as,不用when 或while。 (二)before和after引導(dǎo)的時間狀語從句1. Before是主句動作發(fā)生在從句的前面。還要注意主句和從句之間的時間關(guān)系。2. After表示主句動作發(fā)生在從句動作之后。例如: It will be four days before they e back. 他們要過四天才能回來。 My father had left for Canada just before the letter 。 After you think it over, please let me know what you ,告訴我你是怎樣決定的。(從句用過去完成時,主句用一般過去時) (三)比較until和till 的用法 此兩個連詞意義相同。否定形式表達的意思是“直至某時才做某事”。正確使用這兩個連詞的關(guān)鍵之一就在于判斷句中的動詞該用肯定式還是否定式。 Wait till I call you. 等著我叫你。例如:Let39。t arrive until 6 o39。 Don39。 I didn39。 區(qū)別:1)until可用于句首,而till通常不用于句首。 3)until when 疑問句中,until要放在句首?!? 注意:否定句可用另外兩種句式表示?!? 例如:Not until the early years of the 19th century did man know what heat is. 直到19 世紀(jì)初,人類才知道熱為何物。 5)It is not until… that…. 例如:It was not until I began to work that I realized how much time I had wasted. (四)巧辨before和until在日常英語教學(xué)中,我們遇到學(xué)生問這樣的一些問題: will spend six hours at his desk____he finishes his position. bike hit the tree____I could get off. knocked at the door for more than five minutes____Mrs white answered it. was____yesterday____be____the secret. until;that;knew ;when;knew before;that;found ;that;didn39。 實際上,只要我們把握住兩者使用時本身的含義及主句動詞是終止性的,還是延續(xù)性的,肯定式,還是否定式兩大點,就能容易地解決這類問題。before表示“在……之前”的意思,強 調(diào)時間先后關(guān)系;而until表示“直到……才”的意思,主句是肯定句則表示主句動作的終 止時間;主句是否定句則強調(diào)主句動作的起始時間。常見的動詞是open,start,leave,arrive,finish, stop等。t stop until/before it was midnight. (2)The children won39。t leave the lovely boy until/before his mother came home. 、延續(xù)性謂語詞,這類動詞用stand,stay,talk,be,wait等。 、終止性謂語動詞,只用before。例: (1)It was quite some time before he found the elephant at all. (2)We had walked a long way before we found some water. (3)We