(英语条件句.pptVIP

条件句 the conditional sentence enter Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1 真实条件句 2 非真实条件句 条件句的分类 真实条件句所表的假设是有可能发生或实现的，句中的条件从句与结果从句皆用直陈语气。 非真实条件句所表示的假设多为不可能或不大可能发生或实现的，句中的条件从句和结果主句皆须用虚拟语气。 其中，以虚拟条件句和混合条件句为主。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 我们可以记住这样一个原则，即把时态向过去推一格。 一、对现在情况的虚拟 　　 从句中谓语动词用一般过去式 主句用“would/should/might/could+动词原形”形式，表示对现在不可能实现情况的假想。 　　 一般虚拟条件句 If I were you,I would choose to work in a small town. 　　 如果我是你，我会选择在小城镇工作。（事实上我不是你） 　 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 我们可以记住这样一个原则，即把时态向过去推一格。 二、对过去情况的虚拟 从句中谓语动词用过去完成式 主语用“would/could/should/might+have+动词的过去分词”形式 　　 一般虚拟条件句 If it had not been for your help yesterday,I could not have caught the bus. 　　 如果昨天没有你的帮助，我不会赶上公交车。（事实是你昨天已经 帮助了我，所以我赶上了车) 　 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 我们可以记住这样一个原则，即把时态向过去推一格。 三、对将来情况的虚拟 　　 在表示与将来事实相反的条件从句中 谓语动词可用should do,were to do或动词的过去式三种形式表示，但意义略有不同。should表示的可能性最大，动词过去式的可能性次之，were to do 的可能性最小。 　　 一般虚拟条件句 If things were to be twice，all would be wise. 　　 假如凡是都可以重新做一次，人人皆可成为聪明人。（事实是并不是所有的事都可以重新做一次) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 有些条件句的主句谓语和从句谓语表示的动作在时间上并不一致，这类句子称为错综时间条件句，即混合条件句。 If you had taken my advice then,you would not be in trouble now. 　　 如果当时听我的劝，你现在就不会有麻烦了。(if 条件句是对过去的虚拟，故用过去完成时，而主句是对现在的虚拟，故用“would+动词原形”形式） 　 混合条件句 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 虚拟条件句总结 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyrig