答疑0421英语考研资料免费分享.pdf

答疑 0421答疑检索：虚拟语气But science does provide us with the best available guide to the future,and it iscritical that our nation and the world base（should base 的省略）important policies onthe best judgments that science can provide concerning the future consequences ofpresent actions.【句子结构】1.句子主干：science does provide us with the best available guide to the future；it iscritical2.主语从句：that our nation and the world.of present actions3.定语从句：that science can provide（修饰 the best judgments）4.介词结构作后置定语：concerning the future consequences of present actions（修饰 the best judgments）【翻译】但是科学确实给我们提供了通向未来的最佳可行性指导，而且至关重要的是我们的国家和世界应该在作出重要决策时以科学所能提供的关于现在行为对将来产生影响的最佳判断为依据。Just as on smoking,voices now come from many quarters insisting that the scienceabout global warming is imcomplete,that its OK to keep pouring fumes into the airuntil we know for sure.【句子结构】1.句子主干：voices now come from many quarters2.宾语从句：the science about global warming is imcomplete3.宾语从句：that its OK to keep pouring fumes into the air until we know for sure4.时间状语从句：until we know for sure【翻译】就像在吸烟问题上一样，如今来自许多群体的声音坚持认为关于全球变暖的科学研究并不完善，在我们知道将废气排入空气会对环境产生危害之前，我们可以持续地将废气排入大气当中。【难点分析】虚拟语气是谓语动词的一种特殊形式，用来表示假设、猜测、主观愿望、建议、可能或纯粹的空想等非真实情况。根据时态的不同，主从句的谓语动词可分为以下 3 种情况：（1）表示与真理相反的虚拟语气的结构从句：if+主语+were to do,主句：主语+should/would/could/might/ought to（2）wish 之后接宾语从句时一定要使用虚拟语气（3）if only 用于与现在或过去相反的虚拟语气中，if only（要是就好了）与 I wish 一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同