高三課本第十五單元，INTER GATING SKILLS 和 WORKBOOK READING部分有如下的句子：
⒈The shop was successful，but it was about sixty years before people started to buy jeans for fashion as well as for work.
⒉However，it probably will not be long before the other mountainous areas of China such as Sichuan，Xinjiang and Yunnan are developed，and as more facilities become available，prices will almost certainly fall.
其中涉及到before的用法，下面就其用法進行總結。
一、可以用作介詞
⒈)指時間上早於，在之前，如：
She has lived here since before the war.
她從戰前就一直在這兒住。
⒉)指位置在前面，如：
We knelt down before Grandmas grave.
我們在奶奶的墓前跪下。
⒊)指順序或排列在之前，如：
Your name comes before mine on the list.
名單上你的名字在我之前。
⒋)在某人面前，如：
She said it before the witness.
他是當著證人的面說的。
二、作為連詞
其基本含義是在之前，又可以根據不同語境靈活翻譯成才、還沒來得及就、趁、就等。具體用法如下：
⒈)與情態動詞can/could連用
這時候從句雖為肯定形式，根據漢語表達習慣譯成還沒來得及就，如：
Before I could get in a word，he had measured me.
我還沒來得及插話他就為我量好了尺寸。
Before she could move，she heard a loud noise，which grew to a terribl eroar.
她還沒來得及邁步，就聽見一聲巨響，接著就是可怕的隆隆轟鳴。
⒉)用於肯定句中強調主句所表達的時間，距離長，或花費的精力大，譯成才
We had sailed four days and four nights before we saw lands.
我們航行了四天四夜才看到陸地。
We waited a long time before the train arrived.
我們等了很長時間火車才到。
⒊)用於否定句中，強調主句所表達的時間，距離短，或花費的精力小，譯成不到就如：
We hadnt run a mile before he felt tired.
我們跑了還不到一英里他就累了。
⒋)主句含有hardly，scarcely等半否定副詞時可以譯為剛就
這時候主句應用過去完成時態，從句用過去時，還可以用when替代before如：
We had scarcely reached the school before/when the bell rang.
我們剛到學校鈴聲就響了。
⒌)有時還有寧願的意思
Id shoot myself before I apologized to him.我寧死也不向他道歉。
⒍)用於It+be/take+時間段+before句型
在這一句型中又可以根據主從句的時態分成兩種情況。
若主句是一般時將來時態，從句是一般現在時.若主句是肯定句意思是要過多長時間才若主句是否定形式翻譯成用不了多久就。
It will be two weeks before everything returns to normal.
兩周之後一切才能恢復正常。
It will be many years before the situation improves.
這種狀況或許要過許多年才能得以改善。
It wont be long before we meet again.用不了多久我們就會再見面的。
這時若主句是一般過去時從句也是一般過去時。若主句是肯定句翻譯成多長時間之後才，若主句是否定形式翻譯成沒過多久就。如：
It was some time before I realized the truth.
過了很長一段時間我才了解到真相。
It wasnt long before she became a brave solider.
沒過多久她就成了一名勇敢的戰士。
After that it still took seven years before they got married.
他們又過了七年才結婚。
注意：當主句的謂語動詞為延續性動詞時，before與until有時可以互換。It was an hour before/until the police arrived.
鞏固練習
⒈It was evening ________ we reached the little town of Winchester.
Athat B.until C.since D.before
2.Several weeks had gone by ________ realized the painting was missing.
A.as B.before C.since D.when
3.The America Civil War lasted four years ______ the North won in the end.
A.after B.before C.when D.then
4.It was some time _______ we realized the truth.
A.when B.until C.since D.before
5.-Why didnt you tell him about the meeting?
-He rushed out of the classroom _______ I could say a word.
A.before B.until C.when D.after
6.-How long do you think it will be __ china sends a manned spaceship to the moon?
-Perhaps two or three years.
Awhen B.until C.that D.before
參考答案：DBBDAD
⒈The shop was successful，but it was about sixty years before people started to buy jeans for fashion as well as for work.
⒉However，it probably will not be long before the other mountainous areas of China such as Sichuan，Xinjiang and Yunnan are developed，and as more facilities become available，prices will almost certainly fall.
其中涉及到before的用法，下面就其用法進行總結。
一、可以用作介詞
⒈)指時間上早於，在之前，如：
She has lived here since before the war.
她從戰前就一直在這兒住。
⒉)指位置在前面，如：
We knelt down before Grandmas grave.
我們在奶奶的墓前跪下。
⒊)指順序或排列在之前，如：
Your name comes before mine on the list.
名單上你的名字在我之前。
⒋)在某人面前，如：
She said it before the witness.
他是當著證人的面說的。
二、作為連詞
其基本含義是在之前，又可以根據不同語境靈活翻譯成才、還沒來得及就、趁、就等。具體用法如下：
⒈)與情態動詞can/could連用
這時候從句雖為肯定形式，根據漢語表達習慣譯成還沒來得及就，如：
Before I could get in a word，he had measured me.
我還沒來得及插話他就為我量好了尺寸。
Before she could move，she heard a loud noise，which grew to a terribl eroar.
她還沒來得及邁步，就聽見一聲巨響，接著就是可怕的隆隆轟鳴。
⒉)用於肯定句中強調主句所表達的時間，距離長，或花費的精力大，譯成才
We had sailed four days and four nights before we saw lands.
我們航行了四天四夜才看到陸地。
We waited a long time before the train arrived.
我們等了很長時間火車才到。
⒊)用於否定句中，強調主句所表達的時間，距離短，或花費的精力小，譯成不到就如：
We hadnt run a mile before he felt tired.
我們跑了還不到一英里他就累了。
⒋)主句含有hardly，scarcely等半否定副詞時可以譯為剛就
這時候主句應用過去完成時態，從句用過去時，還可以用when替代before如：
We had scarcely reached the school before/when the bell rang.
我們剛到學校鈴聲就響了。
⒌)有時還有寧願的意思
Id shoot myself before I apologized to him.我寧死也不向他道歉。
⒍)用於It+be/take+時間段+before句型
在這一句型中又可以根據主從句的時態分成兩種情況。
若主句是一般時將來時態，從句是一般現在時.若主句是肯定句意思是要過多長時間才若主句是否定形式翻譯成用不了多久就。
It will be two weeks before everything returns to normal.
兩周之後一切才能恢復正常。
It will be many years before the situation improves.
這種狀況或許要過許多年才能得以改善。
It wont be long before we meet again.用不了多久我們就會再見面的。
這時若主句是一般過去時從句也是一般過去時。若主句是肯定句翻譯成多長時間之後才，若主句是否定形式翻譯成沒過多久就。如：
It was some time before I realized the truth.
過了很長一段時間我才了解到真相。
It wasnt long before she became a brave solider.
沒過多久她就成了一名勇敢的戰士。
After that it still took seven years before they got married.
他們又過了七年才結婚。
注意：當主句的謂語動詞為延續性動詞時，before與until有時可以互換。It was an hour before/until the police arrived.
鞏固練習
⒈It was evening ________ we reached the little town of Winchester.
Athat B.until C.since D.before
2.Several weeks had gone by ________ realized the painting was missing.
A.as B.before C.since D.when
3.The America Civil War lasted four years ______ the North won in the end.
A.after B.before C.when D.then
4.It was some time _______ we realized the truth.
A.when B.until C.since D.before
5.-Why didnt you tell him about the meeting?
-He rushed out of the classroom _______ I could say a word.
A.before B.until C.when D.after
6.-How long do you think it will be __ china sends a manned spaceship to the moon?
-Perhaps two or three years.
Awhen B.until C.that D.before
參考答案：DBBDAD
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