1.當從句中的謂語動詞是延續性的動作時,兩者都可用
While / As I was walking down the street,I noticed a police car in front of the bank.我順著馬路往前走時,發現銀行門前停著一輛警車.
2.當從句中的謂語動詞表示瞬間動作時,不可用while.
3.如果談論兩個長動作,最常用的是while.
While John was sitting biting his nails,I was working out a plan to get us home.約翰坐在那裡咬指甲時,我想出了一個回家的辦法.
不過,as是可以用來說明兩種正在發展或變化的情況的,這時as引導一個持續性的動作,主句中的動作與之同時進行.As we talked on,he got more and more excited.我們繼續往下談的時候,他越來越興奮.
4.如果表示兩個短動作或事件同時發生,最常用的是as
Just as he caught the ball,there was a tearing sound.當他抓住球的時候,有一種撕裂的聲音.
1.當從句中的謂語動詞是延續性的動作時,兩者都可用
While / As I was walking down the street,I noticed a police car in front of the bank.我順著馬路往前走時,發現銀行門前停著一輛警車.
2.當從句中的謂語動詞表示瞬間動作時,不可用while.
3.如果談論兩個長動作,最常用的是while.
While John was sitting biting his nails,I was working out a plan to get us home.約翰坐在那裡咬指甲時,我想出了一個回家的辦法.
不過,as是可以用來說明兩種正在發展或變化的情況的,這時as引導一個持續性的動作,主句中的動作與之同時進行.As we talked on,he got more and more excited.我們繼續往下談的時候,他越來越興奮.
4.如果表示兩個短動作或事件同時發生,最常用的是as
Just as he caught the ball,there was a tearing sound.當他抓住球的時候,有一種撕裂的聲音.