线话语法讲堂：非真实条件句结构图

　　
时态：可能表现从前，当初跟未来的情况。它的基本特点是时态退后。
a.　 同当初事实相反的假设。
句型 ： 条件从句　　　　　主句
一般过去时　　　should( would) +动词原形
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　　b.　 表示于过去事实相反的假设。
句型： 前提从句　　　　　 主句　　　　　
过去实现时　　　 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.
含意：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.
含意： 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
个别从前时　　　　　 should+ 动词原形
were+ 不定式　　　　 would + 动词本相
should+ 动词原形
If you succeeded, everything would be all right.
If you should succeed, everything would be all right.
If you were to succeed, everything would be all right.
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