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2019-2020年（直擊高考）高考英語 語法重難點系列 專題03 連詞before的用法 在時間狀語從句里面，連詞before是出現(xiàn)頻率很高的一個詞。下面是其常見的考點： 1. It was long before從句 過了好久才…… It wasn’t long before從句 沒過多久就…… It will be long before從句 要過好久才…… It won’t be long before從句 過不了多久就…… 1）It was long before they came to help us. 過了好久他們才來幫我們。 2）It wasn’t long before we worked out the plan. 沒過多久我們就把計劃制定出來了。 3） It will be long before my father makes me a paper flower. 要過好久我爸才會給我做紙花。 4） It won’t be long before you are sure to see him. 過不了多久你們肯定就看見他了。 還要注意其變體！ 1) 句型中的long可以換成 確數(shù)詞，即指具體的時間。如： a. It was five years before he came back. 過了五年他才回來。 b. It wasn’t three days before you changed your mind. 還沒過三天你就改變主意了。 c. It will be three periods before school is over. 要過三節(jié)課才會放學。 d. It won’t be one minute before you feel regretful . 過不了一分鐘你就會覺得后悔的。 2) 句型中的long 可以換成概數(shù)詞，即用時間名詞的復數(shù)形式。如： a. It was weeks before I met her. 過了好幾個星期我才遇到她。 b. It wasn’t hours before they acplished their task. 沒過幾個小時他們就完成了任務。 c. It will be months before I go to see my grandma. 要過幾個月我才會去看我姥姥。 d. It won’t be days before they return your books. 過不了幾天他們就會還你書的。 3) 句型中的be可以換成take (花費)。如： a. It took us long before we got on well with each other. 我們花了很久的時間才融洽相處。 b. It didn’t take hours before we finished our wall paper. 還沒有花幾個小時我們就完成了墻報。 c. It will take me half a day before I remember these words. 要花我半天的時間才會記住這些單詞。 d. It won’t take us long before we live our dream. 花不了我們多久時間就能實現(xiàn)我們的夢想。 4) 對句中的long部分提問用how long. 如： a. How long was it before you came back yesterday ? 你們昨天過了好久才回來？ b. How long did it take before he pleted his novel? 花了他多久寫完他的小說？ c. How long will it be before you go to visit him? 要過多久你才會去看他？ d.How long will it take her before she finishes her design? 要花她多久才完成設計？ 2.before I could do,…(還沒來得及…就…) a. Before I could get in a word, the tailor had measured me. 我還沒來得及插話，那裁縫就已給我量了。 b. He had run away before I could give him money. 我還沒來得及給他錢，他就跑了。 c. He had hung off before I could answer the phone. 我還沒來得及接電話他就掛了。 d. Before I could explain ,he had rushed out. 我還沒來得及解釋，他就沖出去了。 3. before sb. does,…(趁還沒做……,……) a.Please write it down before you forget it. 趁你還沒忘就記下。 b.Please eat them up before they bee cool. 趁還沒有變涼把他們吃完。 c.Put it away before it gets broken. 趁還沒有砸把它收起來。 4.hadn’t done …before sb. did 還沒…就……；不到……就…… （用于否定句，強調(diào)主句所表達的時間、距離短或花費的精力小。） We hadn’t run a mile before we felt tired. 我們還沒跑到一里路就覺得累了。 5.had done … before sb. did… 做了……才…… （用于肯定句，，強調(diào)主句所表達的時間、距離長或者花費的精力大） We had sailed four days before we saw land . 我們航行了四天才看見陸地。 6. before sb. knew/realized it. 不知不覺地 We had e to the foot of the mountain before we knew it. 我們不知不覺地來到了山腳。 7.在……之前 a.The train had left before we arrived at the railway station. 我們到達火車站之前火車已經(jīng)走了。 b.The film had been on for ten minuted before we got into the cinema. 我們進電影院前，電影已經(jīng)開始十分鐘了。 8.寧可……決不……(常與will/would連用) a.I will die before I surrender. 我寧死不屈。 b.I would go to the hell before I apologized to him. 我寧下地獄也不給他道歉。 c. He will die of hunger before he steals. 他寧可餓死也不去偷。 高考真題再現(xiàn)： 1.—How long do you think it will be_______China sends a manned spaceship to the moon? 　　—Perhaps two or three years. 　　A.when　　B.until　　C.that　　D.before 答案：D 2.—Why don't you tell him about the meeting? —He rushed out of the room______I could say a word. 　A.before　　B.until　　C when　　D.after 答案：A 3.Scientists say it may be five or six years ________ it is possible to test this medicine on human patients. A. since B. after C. before D. when 答案：C 4. It was evening ________ we reached the little town of Winchester. A. that B. until C. since D. before 答案：D 5. Several weeks had gone by ________ I realized the painting was missing. A. as B. before C. since D. when 答案：B 6.Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. A. as B. since C. before D. until 答案：C