单击此处编辑母版文本样式,英 语,D,选修,7,Unit 21,Human Biology,探究 语法精要,课时 语法专练,Section,Grammar,条件句和混合条件句,Section Grammar,探究 语法精要,探究 语法精要,在英语中，我们一般把条件句分为两种，即真实条件句和非真实条件句。非真实条件句亦可称为虚拟语气。虚拟语气表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,一、,if,引导的虚拟条件句,主从句,构成,时态,if,虚拟条件句,主句,与现在事实相反,if,主语动词过去式,主语,would/should/could/might,动词原形,与过去事实相反,if,主语,had,过去分词,主语,would/should/could/might,have,过去分词,与将来事实相反,if,主语,主语,would/should/could/might,动词原形,一、if引导的虚拟条件句主从句if虚拟条件句主句与现在事实相,If I were a bird,，,I could fly.,如果我是一只鸟的话，我就能飞了。,If we had started earlier,，,we would not have missed the train.,如果我们早点出发，就不会错过这列火车了。,If he shouldn,t come tomorrow,，,we should put off the meeting till next Monday.,要是他明天来不了，我们将把会议推迟到下周一。,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,二、混合虚拟条件句,在虚拟语气中，虚拟条件句与主句所指的时间不一致,(,如一个是过去的，一个是现在的,),，这时主、从句谓语动词的形式需要根据具体的时间来调整，从而构成混合虚拟条件句，即错综时间条件句。该句式中不仅仅存在时间的不同，更重要的是事实和假设的混合，其基本用法如下：,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,9,、,要学生做的事，教职员躬亲共做；要学生学的知识，教职员躬亲共学；要学生守的规则，教职员躬亲共守。,2024/11/16,2024/11/16,Saturday,November 16,2024,10,、阅读一切好书如同和过去最杰出的人谈话。,2024/11/16,2024/11/16,2024/11/16,11/16/2024 1:54:55 AM,11,、一个好的教师，是一个懂得心理学和教育学的人。,2024/11/16,2024/11/16,2024/11/16,Nov-24,16-Nov-24,12,、要记住，你不仅是教课的教师，也是学生的教育者，生活的导师和道德的引路人。,2024/11/16,2024/11/16,2024/11/16,Saturday,November 16,2024,13,、,He who seize the right moment,is the right man.,谁把握机遇，谁就心想事成。,2024/11/16,2024/11/16,2024/11/16,2024/11/16,11/16/2024,14,、谁要是自己还没有发展培养和教育好，他就不能发展培养和教育别人。,16 十一月 2024,2024/11/16,2024/11/16,2024/11/16,15,、一年之计，莫如树谷；十年之计，莫如树木；终身之计，莫如树人。,十一月 24,2024/11/16,2024/11/16,2024/11/16,11/16/2024,16,、提出一个问题往往比解决一个更重要。因为解决问题也许仅是一个数学上或实验上的技能而已，而提出新的问题，却需要有创造性的想像力，而且标志着科学的真正进步。,2024/11/16,2024/11/16,16 November 2024,17,、儿童是中心，教育的措施便围绕他们而组织起来。,2024/11/16,2024/11/16,2024/11/16,2024/11/16,2,、,Our destiny offers not only the cup of despair,but the chalice of opportunity.,(Richard Nixon,American President),命运给予我们的不是失望之酒，而是机会之杯。,二二一年六月十七日,2021,年,6,月,17,日星期四,3,、,Patience is bitter,but its fruit is sweet.,(Jean Jacques Rousseau,French thinker),忍耐是痛苦的，但它的果实是甜蜜的。,10:516.17.202110:516.17.202110:5110:51:196.17.202110:516.17.2021,4,、,All that you do,do with your might;things done by halves are never done right.,-R.H.Stoddard,American poet,做一切事都应尽力而为，半途而废永远不行,6.17.20216.17.202110:5110:5110:51:1910:51:19,5,、,You have to believe in yourself.Thats the secret of success.,-Charles Chaplin,人必须相信自己，这是成功的秘诀。,-Thursday,June 17,2021June 21Thursday,June 17,20216/17/2021,9、要学生做的事，教职员躬亲共做；要学生学的知识，教职员躬亲,1,想象的过去事件可能对现在或将来有影响,句子,时间意义,谓语形式,从句,与过去事实相反,had done,主句,与现在,/,将来事实相反,would/should/could/might,动词原形,1想象的过去事件可能对现在或将来有影响句子时间意义谓语形式,If you had taken his advice then,，,you would be better now.,如果你当时听取了他的建议，你现在会好些。,If you hadn,t watched TV late last night,，,you wouldn,t be so sleepy now.,如果你昨晚看电视不看到那么晚，你现在就不会这么困倦。,If I had spoken to him yesterday,，,I should know what to do now.,假如昨天我对他说了，现在我就知道该怎么办了。,If you had taken his advice th,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,If I had studied hard,，,I would be studying in college now.,如果我努力学习的话，我现在就在大学里学习了。,If he hadn,t left for Shanghai,，,he would be helping me now.,如果他不去上海的话，他现在就帮助我了。,If you had not given me a lift,，,I would be walking in the rain now.,如果你不让我搭车，我现在还冒雨走着呢。,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,3,想象中的现在状态可能对过去有影响,If I were you,，,I would have gone to watch the Expo then.,如果我是你，当时我就去看世博会了。,If she didn,t speak a few languages,，,she wouldn,t have got that job.,如果她不会说几种语言，她就不能得到那份工作了。,句子,时间意义,谓语形式,从句,与现在事实相反,动词的过去式,(be,were),主句,与过去事实相反,would/should/could/might,have done,3想象中的现在状态可能对过去有影响句子时间意义谓语形式从句,三、虚拟条件句的特殊用法,1,省掉,if,的条件从句结构：若条件句把,if,省略，则需要把,were,，,had,，,should,放在主语前，形成部分倒装结构。,Had you taken my advice,，,you wouldn,t have failed in the examination.,If you had taken my advice,，,you wouldn,t have failed in the examination.,如果你听了我的建议，你就不会考试不及格了。,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,2.,含蓄虚拟条件句：有时虚拟条件不用条件从句而用不定式、分词、介词、名词、连接词、定语从句、短语或上下文暗示,(,常见,without,，,but for,，,otherwise,，,or,等表达,),，此时句子的时态要依具体情况而定。,I was busy that day,，,otherwise I would have gone there with them.,If I hadn,t been busy that day,，,I would have gone there with them.,我那天很忙，否则，我就和他们一起去那儿了。,高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,Without electricity(,If there were no electricity),，,life would be quite different today.,如果没有电，今天的生活就会完全不同。,But for your help(,If it had not been your help),，,it would have caused a serious loss.,要不是你的帮助，那将会导致巨大的损失。,A true friend would not do such a thing.(,If he were a true friend,，,he would not do such a thing.),一个真正的朋友是不会做这样的事的。,Without electricity(If there,3,含虚拟语气的句子：,but,真实情况,Mary would tell us something about London,，,but she isn,t from London.,玛丽很想告诉我们一些关于伦敦的事情，但她不是来自伦敦的。,(,前面表示现在的虚拟，,but,后从句表示一个客观情况,),高中(北师大版)英语选修7ppt课件：unit-21-section-6-条件句和混合条件句,课时 语法专练,课时 语法专练,谢谢观看！,谢谢观看！,