高考英语语法复习课件15.ppt

sb.+ would (should, could, might)+动词原 形
sb.+ would (should, could, might) + have done
sb.+ would (should, could, might) +动词原
形
与现在事实相反（例句）
• If I were rich enough, I would travel around the world.假如我很富有，我就会周游世界。 (The fact is that I can’t travel around the world because I don’t have enough money.)
虚拟语气的用法
• 虚拟语气用在非真实条件句中 • 虚拟语气用在宾语从句中 • 虚拟语气用在表语从句、同位语从句中 • 虚拟语气用在主语从句中 • wish和as if/though后的虚拟语气 • 虚拟语气用在其他句型中
虚拟语气用于非真实条件句
• 真实条件句VS非真实条件句 试比较： If it rains tomorrow, we’ll have to stay at home. If I were you, I would accept the offer.
友情提醒
1. 错综时间条件句 在错综时间条件句中，虚拟条件从句和主 句动作发生的时间不一致，因此，主句和 从句的谓语动词要根据各自所指的不同时 间选用适当的虚拟语气形式。例如：
• If you had listened to the teacher carefully in class, you would know what to do now. （过去 现在）
• If Mary should arrive today, she must have started three days ago.(将来 过去)
2. If的省略 条件句中如有were, should, had，可以省去if， 而把were, should, had放在主语前，用倒装结 构。例如：
虚拟语气
虚拟语气概述
虚拟语气用来表示说话人所说的话并不是 事实，而是一种假设、愿望、怀疑或推测。 例如： If I had time, I would certainly go to the movie with you. I wish I were a white cloud.
虚拟语气的表现形式
• Were it necessary, he would resign.
• Should he fail, he would never get another chance.
• Had they met 20 years earlier, they would have achieved greater success.
• 虚拟语气在非真实条件句中的假设通常有三种情 况： ①与过去事实相反 ②与现在事实相反 ③与将来事实可能相反。
非真实条件句中谓语动词形式
条件从句
主句
与现在事实相反
与过去事实相反 与将来事实可能 相反
If sb.+过去式 （be的过去式是 were）
If sb.+ had done
If sb.+ A. 过去式 B. were to do C. should +动 词原形
虚拟语气通过谓语动词的特殊形式来表示。例如：
1. God bless you. 2. If he were here, he would know what to do. 3. If you had come a little earlier, you would
have met her. 4. She suggested that we should keep emailing
• If I were you, I wouldn’t have missed the film last night. (现在 过去)
• IfLeabharlann Baiduthey had left home in early morning, they would arrive in half an hour. (过去 将来)
• If I had a car, I should be very happy. 假如我 有一辆汽车，我应该很高兴。
• If I were a bird, I could fly freely in the sky.假 如我是一只鸟儿，我就会在空中自由飞翔。
与过去事实相反（例句）
• If I had known her telephone number, I would have called her. 假如我当时知道她的电话号码， 我就会给她打了电话。(The fact is that I didn’t call her because I didn’t know her telephone number.)
• If I should go abroad, I would go to America. 假 如我要出国，我就会去美国。 snowed(常用形式)
• If it were to snow(可能性较小) tomorrow, I should snow(可能性较大)
should(would) stay at home.
• If he had got up earlier, he could have caught the train. 假如他早点起身的话，他本来能赶上那 趟火车。
与将来事实可能相反（例句）
• If she were to marry Jack, she would be happy. 如果她嫁给杰克，她会幸福的。
each other.
5. They should have arrived by now. 6. Should I have time, I would read the
book again. 7. I wish I hadn’t done that.
8. He talked as if he had seen it with his own eyes.