before用法小结.ppt

1、before 用法小结,Before 用作连词，其基本词义是 “ 在-之前”，用来表示时间或顺序。如： Turn the light off before you sleep. 睡前先把灯熄掉 Think before you speak. 说话之前应先想清楚 但在不同的语境中before 有不同的翻译,Before 表示“不等- 就- /尚未-就-” .- why didnt you tell him about the meeting? - He rushed out of the room _ I could say a word. (我还没来得及说他就冲出了房间) A. before

2、B. until C. when D. after,before,._ I could get in a word, he had measured me. 我还没来得及插上话，他就给我量好了尺寸 A.After B. When C. since D. before .The phone stopped ringing _ I Answered it. (我还没来得及接，电话就挂断了) A. until B. while C. before D. after,2. Before 表示“不知不觉，还没弄清就- ” 此意常用于 before sb. know/realise- Time passe

3、d quickly and three months went by before I knew it. (时间飞快流逝，不知不觉3个月过去了) Several weeks had gone by before I realised it. (不知不觉几个周就过去了),3.Before 表示“ 以免，不然， 趁-还没 ” Its cloudy. Take an umbrella before You regret it. (带把伞吧 以免后悔) Ill call him before I forget . (趁着还没忘记我就给他打个电话) Put that away before it get

4、s broken. (把它收好，以免砸了),4. Before 用于这两个句型： It was /wasnt +一段时间 + before 从句 （过了多久/没过多久才-） It will / wont + 一段时间 + before 从句 （还得过多久/用不了多久就-） It was a long time before we met again. 过了很久我们才再次见面 区别：It is +一段时间+ since 从句,It wasnt 3 years before we met again. (没过3年我们就又见面了) It will be two years before we mee

5、t again. (还要过两年我们才能见面) It wont be long before you regret. （用不了多久你就会后悔） We didnt wait long before he came back. (我们没等多久他就回来了),5. Before 表示“ 宁可-而不愿-” Id die before I apologized to them. (我宁死也不向他们道歉) They would fight to death before they surrendered. (他们宁死也不投降) We will die before we give in. (我们宁死不屈),巩

6、固性练习 1.A scientist must practise a lot _he can use all data tools well. A. as soon as B.when C.until D. before 2._ she realized what was happening, she was hit over the head. A.When B. before C. since D. as,B,D,3. why didnt you help the little boy? -Oh, sorry. He had struggled to his feet_ I ran ove

7、r. A. until B. after C. before D. since 4. He made a mistake, but then he corrected the situation _it got worse. A. until B. when C. before D. as,C,C,5. Scientists say it may be 5 years_ it is possible to test this medicine on human patients. A. Since B. after C. before D. when 6. Someone called me

8、up in the middle of the night, but they hung up _ I could answer the phone. A. as B. since C. while D. before,C,D,7. Youd better give it up _ it is too late as its very dangerous. A. before B. as C. when D. since 8. It would be months _ he was fit for work. A. until B. since C. before D. after,A,C,9. It was evening _ we reached the little town of Winchester. A. that B. until C. since D. b