if引导的虚拟条件句.ppt

虚拟语气
语法深化
If引导的真实条件句(16)：
主将从现
If she shows up, we’ll stick with her.
I’ll give you a call if anything comes up.
I’ll kick you out if don’t listen to me.
2. 主祈从现
Catch me if you can.
Love me if you dare.
If he comes, he is going to bring his violin.
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虚拟语气
语法深化
If引导的虚拟条件句：
与现在事实相反的假设
条件从句　　　　　主句
一般过去时 should( would could) +动词原形
如果我是你，我不会让他走。
=If I were you, I would not let him go.
如果我能飞，你就抓不到我。
=If I could fly, you would not catch me.
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虚拟语气
语法深化
If引导的虚拟条件句：
2. 与将来事实相反的假设
条件从句　　　　　主句
一般过去时 should( would could) +动词原形
Were to+动词原型
Should+动词原型
If you should succeed, everything would be all right.
If you were to succeed, everything would be all right.
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虚拟语气
语法深化
If引导的虚拟条件句：
3. 与过去事实相反的假设
条件从句　　　　　主句
Had done would, should, could +have done
If he had come yesterday, I should / would have told him about it.
If he had not been ill and missed many classes, he would have made greater progress.
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虚拟语气
语法深化
If引导的虚拟条件句：
4. 混合虚拟语气
If you _______ him yesterday, you ______ what to do now. (ask, know)
（从句与过去事实相反，主句与现在事实相反。）
If it had rained last night (过去), it would be very cold today (现在).
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虚拟语气
语法深化
If引导的虚拟条件句：
5. 虚拟条件句的倒装
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
If they were here now, they could help us.
= Were they here now, they could help us.
If you had come earlier, you would have met him.
= Had you come earlier, you would have met him.
If it were to rain, the crops would be saved.
=Were it to rain, the crops would be saved.
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1. This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense. (09年天津市高考)
   A. would          B. should    
C. could      D. might
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2.—It was the drug，not the disease，that killed Michael Jackson.
—He would be still alive today if he ___ that drug.
A. not take