17、练习 ，这些都是教学中常用的练习 ，包括了 非真实条件句的多种情况 。
用上述的方法 ， 解决这样的问题并不费力：1. Last Sunday we all stayed indoors because it rained thewhole day.用 if 后 ， 主从句从真实条件句的基础上倒移一个事态 。
If ithadnt rained for a whole day,we wouldnt have stayed indoors last Sunday.2. John and Joseph weren t given the tickets, so they did notgo to the cin 。

18、ema. If John and Joseph had been given thetickets, they would have gone to the cinema.3. David Smith was required to leave the country within 24 hours because he had acted as a spy for a foreign country. 主句中的过去完成时“倒移”时其谓语动词不再变形 ，正如直接引语变成间接引语时那样： David Smithwould not have been required to leave the c 。

19、ountry if he ahdn tacted as a spy for a foreign country.4. I don t like the diamond necklace, sdooIn t want to haveit.If I liked the diamond necklace, I would want to have it.5. Johnson was warned of the danger last night, so now he does everything very carefully.本句和下两句是错综时间条件句 ，即主句和从句的时态不相 同 ， 本来可以成为 。

20、非真实条件句教学中的一个难题 ，但是现在只要按照主从句谓 语动词时态形式“倒移”的规则 ， 问题就可以迎刃而解 。
If Johnson hadn t been warned of the danger last night, he wouldn t do everything so carefully.本句和下两句是错综时间条件句 ，即主句和从句的时态不相同 ，本来可以成为非 真实条件句教学中的一个难题 ，但是现在只要按照主从句谓语动词时态形式 “倒 移”的规则 ， 问题就可以迎刃而解 。
If Johnson hadn t been warned of the danger last night, he。

21、wouldnt do everything so carefully.6. Joan received the invitation yesterday. She will go to the party tomorrow evening. If Joan hadn t received the invitationyesterday, she would not go to the party tomorrow evening.7. Larry has heard from quite a few friends in China and now he knows much about th 。

22、is country. Larry wouldn t know muchabout this country if he hadn t heard from quite a few friendsin China.8. Bob isnt here, so we cant ask him to help with the task. 在非真实条件句中 be 的过去时形式一般用 were： If Bob were here, we could ask himeto help with the task.9. We will have a sports meet next Sunday, so al 。

23、l the students will have to come to school then. 注意从句的形式： If we didn t have a sports meet next Sunday, the students wouldnt have to come to school then. If we weren t to have a sports meet next Sunday, the students wouldnt have to come to school then. If we shouldn t have a sports meet next Sunday,。

24、thestudents wouldnt have to come to school then. 关于倒装句式 :在非真实条件句中 ， 如果条件句中有助动词 be, had, should 等 ， 连接词 if 可以省略 ， 如：Should I come late tomorrow, you could ask someone else to take my place.Should anything gone wrong with this device, you should go andcheck with the local dealer.Had you been here a minute l 。

25、ate, you would have caught him cheating in the test.Had we asked him a second time, we would sure have had his advice.Were I to attend the meeting in Shanghai, I would fly there tomorrow.Were they in our place, they would have a totally different opinion of the situation.这时候要注意 ，如果条件句在主句后面 ，这种倒装的句式看 。

26、 着相当别扭：The whole school would not have had that silly idea of the so called invention had they noticed the date of the invention issued: April 1st.I would have taken what you said for granted had I not been to the place myself.You would get double paid were I to ask you for additional service.We wou 。

27、ld cancel the trip were the weather to be rainy.Go and check with the local dealer should the recorder not work properly.I would have to change my plan should anything wrong happens.最后再次强调两点：A、对最后一组句子还要些说明： 如果条件从句指的是将来时间 ， 非真实条件句有三种形式： 第句：因为真实条件句指将来时间时用现在时态 ， 倒移其 时态形式 ， 直接用一般过去时的形式；第句：这里用 were to do形式 ， 应该指 。

28、明这是由be to do 结构倒移时态形式的结果(从 is(am,are)to do 到 were to do)； 第句：这里用should do,可以解释为should与were to在 此句式同义 ， 属于同义替代 。
E、非真实条件是建立在与事实相反、或很难成为现实的假 设基础之上 ， 其主句是建立在这样的假设之上的推论 ， 主句的 would(could, might, should )表示着一种不可实现 ， 或难以实现的可 能性 ， 决不能漏掉 。
掌握了“时态倒移” 的规律 ，非真实条件句的其他问题就很 容易解决了 。

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