第四学时案】2014-2015学年高中英语（人教版，选修6）同步检测Unit++1+Art.ppt

Unit 1　Art　　　　　　　　　　　 　　　　　 第四学时　Grammar;虚拟语气;一、概念;二、虚拟语气在条件从句中的用法;1．表示与现在事实相反的假设和结果 (从句动词用过去式，be 动词的过去式用“were”，表虚拟，主句动词用would/could/might do) If I were you，I_would_ study harder in Senior 2. 我是你的话，我会在高二阶段更努力学习。 If my brother were_here，everything would_be all right. 要是我哥在这儿，一切都没问题了。;?即学即练;2．表示与过去事实相反的假设或结果 (从句动词用had done，主句动词用 would have done) If you had worked harder，you would/could/might have passed your exams. 如果你更努力一点，你就会(可能会)通过考试。 If I had_been on the spot，I would /should/could/might have called an ambulance. 如果我当时在事故现场，我就会打电话叫救护车。;?即学即练;3．表示与将来事实相反的假设和结果 (从句动词有三种形式：were to do/should do/did，主句动词用 would do) If it_were_sunny tomorrow，I would come to see you. 明天要是天气好的话，我来看你。 If it should_rain，the crops would be saved. 假如下雨，庄稼就一定(有可能)得救。;If it were_to_snow this evening，they would not go out. 如果今晚下雪，他们将不出去了。;?即学即练;4．主、从句的动作发生时间不一致的情况 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，这时主句、从句中动词的形式要根据它所表示的时间加以调整。 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_practised speaking English more，you would_be able to speak it fluently. 如果你当时多练习讲英语，现在就能讲得很流利了。;5．虚拟条件句可以转换的形式 (1)省略连词if。 在书面语中，如果虚拟条件句中有were，had或should，可以把if省略，并把这几个词放到主语之前，构成主谓倒装，如： Were_I you (If I were you)，I would not do it. 我要是你，就不做这事。;Should_he come (If he should come)，tell him to ring me up. 他要是来了，让他给我打个电话。 (2)用介词短语代替条件状语从句。 Without air (If there were no air)，there would be no living things. 如果没有空气的话，就不会有生物了。;Without/But_for your help (If it hadnt been for your help) I couldnt have done it. 要不是你的帮助，我就不可能完成这件事。