详解before用法(课堂PPT)

1、1、使用before作为连接者，2、before的基本含义是“在前面”，用于表示时间或顺序。示例：Turn the light off before you sleep。Think before you speak。)但是在上下文中，before有不同的含义。3，1 before是“不等于”、“还没有”的示例1:why did nt you tell him about the meeting？(2006年四川)he rushed out of the room _ _ _ _ I could say a word . a . before b . until c . when d . aft

2、er解决方案：答案是a。在标题中，before表示“不等于”、“还没有”，表示子句的动作尚未发生，基本句子的动作已经发生或完成。句句：我还没到他说话的时间就跑出了房间。另一个示例：4，before I could get in a word，he had meased me。我还没来得及插嘴，他就给我量了一下尺寸。the phone stopped ringing before I answerred it。我没来得及接，电话断了。5，2 before是“我不知道还没有明白”(before sb .经常用于知识文库)示例2:several weeks had gone by _ _ _ _ _

3、 I realized the painting was missing(2004全国)A. asBbefore C. sinceD。when，6，解决：这个问题最容易选择c或d项，正确答案是b。Since表示，时间继现在之后，时间上与had gone矛盾。使用When不能姜潮时间流逝的无意识性。另一个示例：time passed quickly and three month swent by before I knew it。时间飞快地过去，不知不觉地过去了三个月。7，3 before是“避免，否则”的示例3:its cloudy . take an umbrela _ _ _ you r

4、egret it . a . but b . and c . after d . before分析：and beforeAfter的意思是“之后”，不符合常理，下雨之前要带雨伞。Before在这里的意思是“不后悔”。因此，使用before的示例有很多。例如Put that away before it gets broken。请收好，以免毁灭。Do it before you forget。尽快，否则就忘了。8，4 before是it was/will be时间before.用于文章图案。示例4:It wont be long _ _ _ _ _ _ _ you regret what you

5、 have done . a . afterb . beforec . sinced . until，9，解决方法：It was.表示“过了很长时间后(强调的时间的长时间)”，否定句表示“短时间(强调的时间的短时间)”。例如：it will be two years before we meet again。见面需要两年。It want long before he married again。很快又结婚了。我们的didnt wait long before he came back。我们没有等他回来很久。10，5 before为“相反，优先于”(对于表优先级)示例5:they would f

6、ight to death _ _ _ they surrendered(投降)a . beforeb . aftoreBefore领导的子句与will，would一起使用时，意思是“宁愿”。Before作为介词也有意义。示例：杜鲁门choose death before dishonor。大丈夫还不如不杀。Id die before I apologize to them！我宁愿向他们道歉！We will die before we give in。我们会死的。11，6。before姜潮“仅”(子句的动作慢或慢)示例6:they sailed along the Pacific ocean

7、for two weeks _ _ _ they arrived home . a . since b . when解答after:这个问题的正确答案是c。他们在太平洋航行了两周，然后回家了.强调节动作发生得晚于订单场动作。另一个示例：I thought carefully about it before I made a decison。我再三考虑后决定了。it may be many years before the situation improves。可能需要数年来改善这种情况。7.在某人或事物面前12，1 . a scientist must practie _ _ _ _ _ he

8、 can use all data(数字)tools well . a . as soon as b . when c . until d . befoolsthe next moment，_ _ _ _ _ _ she realized what was happing，she was hitover the head . a . when b . before c . since d . as3 . why de哦，sorry。he had struggled to his feet _ _ _ _ _ _ _ _ _ _ _ I ranover . a . until b . after c . b