第一节虚拟.doc

第一节： 语气 第一枝 是语气， 语气重点是虚拟。虚拟语气常假设， 句子之中状从多。 现实相反之假设， “实动”过去be用were。 主句would+动原, 还可could与should。 解释：实义动词用过去式， be过去式用were。 If I were you, I should do that thing. 如果我是你，我将做那件事。 If I knew the answer, I would tell you. 如果我知道答案，我将告诉你。 You could do the same thing if you were in my place. 如果你处于我的位置，你也能做同样的事。 练习： 1．All bodies fall at the same rate if there no resistance of the air. A. will---is B .would ---were C. should ---were D. should –are 答案： B 2．If the air supply from a motor engine the car would stop. A .cut off B .had cut off C. were cut off D. had been cut off 答案：C 3. If we did not have air, there no sound. A .were B. is C. will be D .would be 答案： D 4．Suppose there ____ no gravitation force, objects _____ not fall to the ground when dropped. A. is , will B. was , could C. were ,would D. was would 答案：C 5．____，all the students would hear. A. If the teacher had spoken louder B. If the treacher will speak louder C. Had the teacher spoken louder D. If the teacher sopker louder 答案： D 过去相反之假设 ， had been (done)成规则 。 主句would have done , minght /could 与should。 解释：条件从句用had+过去分词，主句用would (should, might, could) have + 过去分词,be动词用had been。 If you had worked hard, you would have passed the exam. 如果你努力学了，你就会通过那次考试。 If we had arrived here two minutes earlier, we could have caught the train. 如果我们当初早两分钟到达这儿，是可以赶上那趟火车的。 If I had been at the concert, I might have seen you. 如果我当初去那个钢琴演奏会，我可能就见到你了。 练习： 1．If things as they were ,the valley would have been a desert. A .had left B. had been left C. were left D. left 答案：B 2． If there had been no radio at that time ,I so much about the world . A. could not learn B. did not learn C .had not learn D. would not have learned 答案： D 3. If it for computers, a large number of technological advances would have been quite impossible A.had not been