While的用法歸納

下面是本站小編爲同學們歸納了While的用法，希望大家可以學以致用!

while的用法可從下述幾點理解與運用：

　　一、while意爲“當……時候”,指一段時間,不能用來表示一個時間點。

While the discussion was still going on, George came in. 當討論還在進行時,喬治走了進來。

　　二、while意爲“而;然而”,表示轉折。

There're plenty of rain in the southeast, while there's little in the northeast. 東南部雨量充足,而西北部則很少下雨。

　　三、while意爲“雖然;儘管”,表示讓步。

While I admit his good points, I can see his shortcomings. 儘管我承認他的優點,但我還是能看到他的缺點。

　　四、while意爲“只要”,表示條件。

We can surely overcome these difficulties while we are closely united. 只要我們緊密地團結一致,一定能克服這些困難。

　　五、while從句中的省略。

當while從句中的主語與主句的主語一致,且含有be的某種形式時,從句中的主語連同be可同時省略。

While listening to the radio, she fell asleep. 她在聽收音機時睡着了。

While in London, he studied music and painting. 在倫敦時,他學習音樂和繪畫。

　　六、while可用作名詞,意爲“一會兒;一段時間”。

作名詞用時,主要用於短語中: after a while “過了一會兒”; all the while “一直,始終”; a short / little while ago “剛纔”; once in a while “偶爾,間或”; wait / rest(for) a while “等 / 休息一會兒”。

I haven't seen her for a long while.我好久沒有看見她了。

Where have you been all this while?這一陣子你到哪去了?

He usually goes to work by bike, but once in a while he goes by bus. 他通常騎自行車上班,但偶爾也乘公共汽車。

I looked everywhere for the letter, but it was in my pocket all the while. 我到處找那封信,卻不知它一直在我口袋裏。

　　七、while與when以及as之間的區別。

1. 當從句中的謂語動詞是持續性的動作時,我們可以用while, when或as。

While / When / As I was walking down the street, I noticed a police car in front of the bank.我順着馬路往前走時,發現銀行門前停着一輛警車。

2. 當從句中的謂語動詞表示瞬間動作時,不可用while。

He was on the point of leaving when someone knocked at the door. 他正要走,這時有人敲門。

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. 約翰坐在那裏咬指甲時,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或just as,也可用when。

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。

I thought of it just when you opened your mouth. 就在你要說話的時候,我也想到了。