高中英语 Unit21 Lesson 1 Super Athletes教案 北师大版选修7.doc

unit 21 human biologylesson 1 super athletesgrammar : conditionals revision1条件句有两类，一类是真实条件句，一类是虚拟条件句。2如果假设的情况是有可能发生的，就是真实条件句（zero conditional）。真实条件句中的谓语用陈述语气。eg。if it doesnt rain tomorrow, we will go to the par.如果明天不下雨,我们就去公园.3.如果假设的情况是过去或现在都不存在的,或将来不大可能发生的,则是虚假条件句,共有三种情况.eg. if he had seen you yesterday, he would have asked you about it.如果他昨天见到你,他会问你这件事的.(事实上他昨天没有见到你,因此也未能问你这件事.)4.在含有虚拟条件句的复合句中,主句和从句的谓语都要用虚拟语气.虚拟条件从句和主句的动词形式列表如下:时间从句主句与现在事实相反动词过去式(be动词的过去式一般用were)would(should/could/might)+动词原形与过去事实相反had+过去分词would(should/could/might)+had过去分词与将来事实相反动词过去式/should+动词原形were to+动词原形would(should/could/might)+动词原形5.虚拟条件句的用法1) 表示与现在事实相反的假设和结果(1st conditional)eg. if i were you,i should/could/would/might tell him the truth. 如果我是你,我就会/可能对他说实话. if he had time, he would/could/might go with you. 如果他有时间,他就会/可能和你一起去. if my brother were here,everything would be all right. 要是我哥哥在这儿,一切都没问题了.2) 表示与过去事实相反的假设和结果(2nd conditional)eg. if you had taken my advice, you wouldnt/couldnt have failed in the exam. 如果你按照我的建议去做,你不会/不可能考试不及格. if i had had the money last week, i should/would/could/might have bought a car. 如果我上星期有了这笔钱,我就会/可能买辆车. she would/could/might have telephoned you immediately, if she had won the game. 如果她比赛赢了,她就会/可能给你打电话. if you had come a few minutes earlier, you would/could/might have met the famous singer. 如果你早来几分钟的话,你就会/可能会见到那个著名的歌唱家.3) 表示与将来事实可能相反的假设和结果(3rd conditional)eg. if it were sunday tomorrow, i should/would/could/might go to see my grandmother. 如果明天是星期天,我就/可能去看我的奶奶. if it were to snow this evening,they would not go out. 如果今晚下雪,他们就不出去了. if it should rain,the crops would/could/might be saved. 如果下雨,庄稼就一定/可能有救.6.主,从句的动作发生时间不一致的情况(mixed conditional) 有时条件从句中的动作和主句中的动作发生的时间不一致,这时动词的形式要根据它所表示的时间加以调整.eg. if you had listened to the doctor, you would be all right now. 如果你当初听了医生的话,身体现在就好了.(从句动作指过去,主句动作指现在) if you had practiced