研究生专业英语阅读9.pptVIP

* * Lecture 9 虚拟语气、强调 虚拟语气 1. 对将来情况的主观推测 ：“一旦、万一” 从句（should＋动词原形/ were+to do） 主句（一般将来时/ 过去将来时/ 祈使句） Should the nucleus have too few neutrons, the inverse reaction may (might) take place. If this change were to be included in the analysis, it would become extremely complex. 练习 1.一旦出现异常情况，应立即关闭电源(power supply)。 2.万一出现(occur)皮肤反应(a skin reaction)，立即停用（discontinue） Should anything abnormal happen, turn off the power supply at once. Discontinue at once should a skin reaction occur. 2. 表示与现在事实相反的情况： 从句（过去时） 主句（should/would/could/might+do） If there were no gravitation, everything would fly off the earth into space. Were there no resistance of air, all bodies at the same height would fall at the same speed. 练习 人类(man)若把太阳光全利用起来，就不需要(have no need for)煤或其他燃料了。 If man made use of all the sunlight, he would have no need for coal or other fuels. 3. 表示与过去事实相反的情况 从句（过去完成时） 主句（should/would/could/might+have done） 如果他们当时不使用电子计算机，解这道题就要花费很长时间。 If they had not used electronic computers, it would have taken them a long time to solve this problem. 4.出现在宾语从句、主语从句、表语从句和同位语从句中 常见的动词、形容词和名词P.131 It is recommended that the reader use a pocket calculator to do the mathematical work required in basic electronics. We recommend that he not try to absorb this chapter completely before proceeding to the subsequent chapters. 练习 1.在原方程中检验一下所有的解是十分重要的。 It is very important that _________. 2.人们建议应立即修改(modify)这个设计。 It is suggested that ___________. 3.这来自于输出要稳定这一需要。 This comes from the necessity ______. 4.一个必要条件是该积分(integration)是尤拉方程（Euler’s equatiom）的一个解。 A necessary condition is that________. 练习 It is very important that all solutions be checked in the original equation. 2. It is suggested that this design be modified at once. 3. This comes from the necessity that the output be stable. 4. A necessary condition is that this integration be a solution to Euler’s equation. 5. 在as …if (as though)引导的从句中 涉及将来和现在的情况，谓语动词用一般过去时（be用were） 涉及过去的情况，谓语动词用过去完成时 这根传输线的作用好像它是开路似的。 This transmission line