语 境 自 主 领 悟
先观察原句
后自主感悟
1．If the rules of perspective had not been discovered，no one would have been able to paint such realistic pictures．
2．Without the new paints and the new technique，we would not be able to see the many great masterpieces for which this period is famous．
3．There are scores of modern art styles，but without the Impressionists，many of these painting styles might not exist．
1．例句1中的if引导的虚拟条件句中谓语动词had not been discovered为过去完成式，表示与过去事实相反，主句的谓语动词would have been为would ＋have ＋过去分词。
2．例句2和例句3中的介词without构成的介词短语表示假设的条件，为含蓄虚拟语气，两者都是表示与现在事实相反，主句的谓语动词要用would/should/might/could＋动词原形。
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