虚拟语气详解、练习及答案Word下载.doc

1、 2.祈使语气 祈使语气表示说话人向对方提出请求或下达命令。 Come this way, please! 请这边走。 Dont make any noise, will you 别吵，行吗？ Do be careful when crossing the street. 过马路时一定要小心。 3.虚拟语气 虚拟语气表示动作或状态不是客观存在的事实，而是说话人的主观愿望、假设或推测等。 If I were a bird, I could fly in the air. 如果我是一只小鸟，我就能在空中飞行。 I wish it were spring all the year round. 但愿

2、四季如春。 May good luck be yours! 祝你好运！ 二、条件句中的虚拟语气 英语中条件从句有两类，一类是真实条件句，另一类是非真实条件句。如果假设的情况可能发生，是真实条件句；如果假设的情况是不存在的或不大可能发生的，则是虚拟条件句。 A真实条件句 真实条件句表示的假设是可能发生或实现的，主句和从句的谓语动词都要用陈述语气。 If he doesnt come at 8, we wont wait for him. 如果他八点不来，我们就不等他了。 If a flood happened in the past, there was usually a great loss

3、 of life and property. 过去发生洪水的话，常有很大的生命和财产损失。 We shall go there unless it rains tomorrow. 如果明天不下雨，我们将去那里。 Ill let you use my bike on condition that you keep it clean. 如果你能保持车子干净，我就让你用我的自行车。 B非真实条件句 在含有非真实条件句的复合句中，主句和从句的谓语动词都要用虚拟语气，其构成有三种形式： 与现在事实相反 if条件句的谓语：were did 主句的谓：would （could should might） +

4、 do 与过去事实相反 if条件句的谓语：had done would（could should might） + have done 与将来事实相反 if条件句的谓语：did were should do would （could should might） + do were to do从句中提出一种与客观现实不相符或根本不可能存在的条件，主句会产生的一种不可能获得的结果。条件句中的虚拟语气根据不同的时间有三种不同的形式。时间 从句谓语形式 主句谓语形式将来动词过去式（be用were）should + 动词原形were to + 动词原形would / should / might / c

5、ould + 动词原形现在动词过去式（be 用 were）过去had +动词过去分词would / should / might / could have + 动词过去分词 1 表示与现在事实相反的条件 条件从句用动词的过去式（be动词用were），主句用should（第一人称）或would（全部人称）+动词原形。可用情态动词could, might代替should, would表示情态。 If it were Sunday tomorrow, I would go and see my friends. 明天要是星期天的话，我就去看望我的朋友。 If I were you, I should

6、 go and try. 我要是你，我就去试试。 If wishes were horses, beggars might ride. 如果幻想能成为马匹，叫花子都有了坐骑 would go if they treated me like a slave. 要是他们把我当奴隶对待，我就走。 2表示与过去事实相反的条件 条件从句用动词的过去完成时，主句用should（第一人称）或would（全部人称）+have done，也可用could, might代替should, would。 If I had known your telephone number yesterday, I would

7、have telephoned you. 如果昨天我知道你的电话号码，我就给你打电话了。 If it had not rained this morning, I should have gone shopping. 今天早上要是没下雨，我就去买东西了。 The flood might have caused great damages to the people if we had not built so many reservoirs. 倘若我们没有修建这么多的水库，洪水就会使人民遭受巨大的损失。 3 表示在将来不太可能实现的条件 表示在将来不太可能实现的条件从句有三种形式： were

8、did也可用could, might代替should, would。 If he were here tomorrow, I would speak to him. 明天如果他在这里的话，我就和他谈谈。 If you dropped the glass, it would break. 你要是把杯子掉下来，会打碎的。 If she had time, she could help me. 她要是有时间，就会帮我了。 should do 条件从句中不管什么人称都用should do，可表示有偶然实现的可能性。 If it should rain, the crops could be saved

9、. 假如下雨，庄稼可能就有救了。 We would trust him if he should be honest. 如果他真是诚实的，那我们就相信他。 were to do 条件从句用were + to do。这种形式比较正式，常出现在书面语中，其假设成份很大，实现的可能性很小。 If I were to do the work, I should do it in a different way. 要是我做这项工作，我就会以不同的方式去做。 If the headmaster were to come, what would we say to him 假如校长来了，我们对他说什么呢？

10、对比： 将来不太可能实现的三种非真实条件句中的虚拟语气对比 If it snowed tomorrow, I would stay at home. 如果明天下雪的话，我就留在家里。 （常用形式） If it should snow tomorrow, I would stay at home. 如果明天下雪的话，我就留在家里。 （可能性较小） If it were to snow tomorrow, I would stay at home. 如果明天要下雪的话，我就留在家里。（可能性最小）3. 运用条件句中的虚拟语气时，须注意的几个问题（1） 当从句的主语为第三人称单数时，谓语动词若是系动

11、词be时，可用was代替were。但在倒装虚拟结构及if I were you, as it were中，只能用were。如：Were I ten years younger, I would study abroad. 要是我还年轻十岁的话，我会去国外学习。If I were you, I would try my best to grasp the chance. 要是我是你的话，我要尽力抓住这次机会。（2） 有时，虚拟条件句中，主、从句的动作若不是同时发生时，须区别对待。从句的动作与过去事实相反，而主句的动作与现在或现在正在发生的事实不符。If I had worked hard at

12、school, I would be an engineer, too. 如果我在学校学习刻苦的话，我现在也会使工程师了If they had informed us, we would not come here now. 如果他们通知过我们的话，我们现在就不会来这里了。从句的动作与现在事实相反，而主句的动作与过去事实不符。If he were free today, we would have sent him to Beijing. 如果他今天有空的话，我们会已经派他去北京了（from ）。If he knew her, he would have greeted her. 要是他认识她

13、的话，他肯定会去问候她了。从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。If it had not been raining too much, the crops would be growing much better. 如果天不下太多的雨的话，庄家会长得更好。If he had been working hard, he would be working in the office now. 要是他工作一直努力的话，他现在已进了办公室了。（3） 当虚拟条件句的谓语动词含有were, should, had时，if可省略，而将were, should, had等词置于句首。Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。Were she here, she would agree with us. 如果她在这儿的话，她会同意我们的。Had he learnt about computers, we would have hired him to work here. 如果她懂一些电脑知识的话，我们会已经聘用他来这里工作了（from www.yygram