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1、Translation如果我是一只小鸟，我就能飞。如果我是一只小鸟，我就能飞。Translation如果我是一只小鸟，我就能飞。如果我是一只小鸟，我就能飞。If I were a bird,I could fly.Translation如果我是一只小鸟，我就能飞。如果我是一只小鸟，我就能飞。If I were a bird,I could fly.Is it possible for you to be a bird?Translation如果我是一只小鸟，我就能飞。如果我是一只小鸟，我就能飞。If I were a bird,I could fly.Is it possible for yo
2、u to be a bird?No,it isnt.The situation is not real or is imaginary.Grammar and usageUnreal conditionals虚拟语气中的非真实条件句虚拟语气中的非真实条件句虚拟语气体现在虚拟语气体现在谓语动词的形式和时态谓语动词的形式和时态上。上。For example:虚拟语气的体现虚拟语气的体现If I were a millionaire,I would travel around the world.If I had a lot of money,I would donate some to the H
3、ope Project.If I knew the answer,I could tell you.In summary,these imaginary conditions are contrary to the present,the past or the future situation.虚拟语气的体现虚拟语气的体现The present situationIf sb.did/were,sb.would/could/might/should do如果我再高那么一点点，我就能碰到那个按钮了。如果我再高那么一点点，我就能碰到那个按钮了。I could reach that button i
4、f I were a bit taller.非真实条件句的时态表达非真实条件句的时态表达如果如果if 假设的情况完全不存在或者实现的假设的情况完全不存在或者实现的可能性很小可能性很小,可以说几乎没有时可以说几乎没有时,就需要用就需要用虚拟语气来表达虚拟语气来表达,此时的句子时态比真实此时的句子时态比真实条件句中的时态条件句中的时态后退一步后退一步。而非真实条件句的假设分为而非真实条件句的假设分为三种情况三种情况，与，与现在现在事实相反的假设、与事实相反的假设、与过去过去事实相反的事实相反的假设和与假设和与将来将来情况相反的假设。情况相反的假设。虚拟语气虚拟语气条件从句和主句中的虚拟语气条件从句
5、和主句中的虚拟语气 时间时间从句从句 主句主句与与现在事现在事实实相反相反与与过去事过去事实实相反相反主语主语+should/would/could/might+动词原形动词原形do主语主语+should/would/could/might+have doneIf+主语主语+had done/had been doneIf+主语主语+动动词的过去式词的过去式(did/were.)注意：注意：在在if I/he/she/it 之后，可用之后，可用were代替代替was。两者在意义上没有区别，但是两者在意义上没有区别，但是were更为正更为正式，特别是在陈述心存怀疑的事情时，如：式，特别是在陈述心
6、存怀疑的事情时，如：If she were ready,we would go.在与将来事实相反的条件从句中，我们在与将来事实相反的条件从句中，我们可以用可以用were to或或should+do来表示来表示,如如:If I were to fail my English test,I would have to take it again at the end of the term.If he should come tomorrow,I would talk to him about it.与与将来事将来事实实相反相反If+主语主语+did/were to do/should do主语主
7、语+should/would/could/might+动词原形动词原形do语气助动词语气助动词would,could和和might常可常可替换使用，但各有不同的意思。替换使用，但各有不同的意思。would表示打算或计划；表示打算或计划；could表示能力或可能性；表示能力或可能性；might表示可能性。表示可能性。虚拟条件句中的语气助动词虚拟条件句中的语气助动词unreal present conditionals:If were/did ,would do 1.1.假如我有更多的时间，我就会学习法语。假如我有更多的时间，我就会学习法语。If I had more time,I would s
8、tudy French.2.要不是她这么忙要不是她这么忙,她就会出席今天下午的会议她就会出席今天下午的会议了。了。Practice:If she were not so busy,she would attend the meeting this afternoon.unreal past conditionals:If had been/done,would/could/might have done 1)1)如果他抓紧时间，他本来能赶上那趟火车。如果他抓紧时间，他本来能赶上那趟火车。If he had hurried,he could have caught the train.2)2)如
9、果你昨天告诉他，他也许会提些建议了。如果你昨天告诉他，他也许会提些建议了。If you had told him yesterday,he might have made some suggestions.3.unreal future conditionals:If were/did/should/were to,would/should/might do E.g.1)1)假如我要出国，我就会去法国。假如我要出国，我就会去法国。If I were to go abroad,I would go to France.2)2)要是我明天有机会演讲，我会讲讲我的家乡。要是我明天有机会演讲，我会讲讲我的家乡。If I should have a chance to give a speech,I would talk about my hometown.