before的用法 一、连词： 其基本含义是“在……之前”，又可以根据不同语境灵活翻译成“才”、“还没来得及就……”、“趁……”、“就”等。具体用法如下： ⒈)与情态动词can/could连用 这时候从句虽为肯定形式，根据汉语表达习惯译成“还没来得及就”，如： Before I could get in a word，he had measured me. Before she could move，she heard a loud noise，which grew to a terrible roar. ⒉)用于肯定句中强调主句所表达的时间，距离长，或花费的精力大，译成“才” We had sailed four days and four nights before we saw lands. We waited a long time before the train arrived. ⒊)用于否定句中，强调主句所表达的时间，距离短，或花费的精力小，译成“不到……就”如： We hadn„t run a mile before he felt tired. 我们跑了还不到一英里他就累了。 ⒋)主句含有hardly，scarcely等半否定副词时可以译为“刚……就” 这时候主句应用过去完成时态，从句用过去时，还可以用when替代before如： We had scarcely reached the school before/when the bell rang. ⒍)用于It+be/take+时间段+before句型 在这一句型中又可以根据主从句的时态分成两种情况。 若主句是一般时将来时态，从句是一般现在时.若主句是肯定句意思是“要过多长时间才”；若主句是否定形式翻译成“用不了多久就”。 It will be two weeks before everything returns to normal. It will be many years before the situation improves. It won„t be long before we meet again.用不了多久我们就会再见面的。 这时若主句是一般过去时从句也是一般过去时。若主句是肯定句翻译成“多长时间之后才”，若主句是否定形式翻译成“没过多久就”。如： It was some time before I realized the truth. It wasn„t long before she became a brave solider. After that it still took seven years before they got married. 注意：当主句的谓语动词为延续性动词时，before与until有时可以互换。It was an hour before/until the police arrived. ⒈(2004天津)It was evening ________ we reached the little town of Winchester. Athat B.until C.since D.before 2.(2004全国)Several weeks had gone by ________ realized the painting was missing. A.as B.before C.since D.when 3.(2005广东)The America Civil War lasted four years ______ the North won in the end. A.after B.before C.when D.then 4.(2005山东)It was some time _______ we realized the truth. A.when B.until C.since D.before 5.(2006四川)-Why didn„t 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.(2006福建)-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 本文来源：https://www.wddqw.com/doc/1285759df8c75fbfc67db209.html