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非真实条件句的应用

1)时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。

a .　 同现在事实相反的假设。

句型 ： 条件从句　　　　　主句

一般过去时　　　 should ( would ) +动词原形

If they were here , they would help you .

b .　 表示于过去事实相反的假设。

句型： 条件从句　　　　　 主句

过去完成时　　　 should ( would ) have + 过去分词

If she had worked harder , she would have succeeded .

The rice would not have been burnt if you had been more careful .

If my lawyer had been here last Saturday , he would have prevented me from going .

If he had come yesterday , I should / would have told him about it .

含义： He did not come yesterday , so I did not tell him about it .

If he had not been ill and missed many classes , he would have made greater progress .

含义： He was ill and missed many lessons , so he did not make greater progress .

c .　 表示对将来的假想

句型：　 条件从句　　　　　　 主句

一般过去时　　　　　 should + 动词原形

were + 不定式　　　　 would + 动词原形

should + 动词原形

If you succeeded , everything would be all right .

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