Learning about Language名师教学设计2

《if条件句中的虚拟语气》教学设计

【教学目标】

1.通过教师讲解和学生观看视频,学生全面掌握if非真实条件句中虚拟语气的使用。

【教学重点】

1.if引导的非真实条件句中三种不同的虚拟语气。

2.if引导的错综条件句中虚拟语气的使用。

3.含蓄条件句中虚拟语气的使用。

4.if非真实条件句中，If省略后句子用倒装的情况。

【教学难点】

1.含蓄条件句中虚拟语气的使用。

2.if非真实条件句中，If省略后句子用倒装的情况。

【设计思路】

if引导的条件句分为两类：一类是真实条件句,一类是非真实条件句。如果假设的情况是有可能发生的，就是真实条件句；如果是纯属假设情况或是不可能发生或可能性不大的情况，则是非真实条件句。非真实条件句要用虚拟语气。另外，英语中有时非真实条件并不通过条件从句表达出来，而是通过词、短语或上下文暗示有些条件，是由一些短语引出,如：but for, with, without; otherwise, or, but, etc.此种情况下句子也要用虚拟语气。本节课通过视频演示，讲练结合，引导学生准确掌握if条件句中的虚拟语气。

【教学方法】视频讲解，自主学习，归纳总结

【教学过程】

一、

Leading in

今天要学的内容是if条件句中的虚拟语气。

if条件句有两类：一类是真实条件句（First conditional）,一类是非真实条件句(Second Conditional)。如果假设的情况是有可能发生的，就是真实条件句；如果是纯属假设情况或是不可能发生或可能性不大的情况，则是非真实条件句。

二、presentation

（教师播放幻灯片3，学生观看幻灯片，在播放过程中给学生讲解if引导的非真实条件句用虚拟语气的三种情况。）

时间

与现在事实相反

与过去事实相反

If从句的谓语

did(be动词用were) had done 主句的谓语

would(should/could/might..)+do would(should/could/might..)+have done

did 与将来事实相反

were to +do should +do （教师播放幻灯片4，学生观看幻灯片，在播放过程中给学生具体例句，让学生理解掌握if引导的非真实条件句中具体的三种虚拟语气的应用。

1.与现在事实相反，从句谓语动词用一般过去时，主句谓语动词用would(should/could/might..)+do.如：

If he were free now, he would help us. 如果他现在有空的话，它会帮助我们的。 2.与过去事实相反，在从句谓语动词用过去完成时时，主句谓语动词用would(should/could/might..)+have done如：

If I had got there earlier, I would have met Mr. Li. 如果我早点到那儿，我就会遇到了李先生。

3.与将来事实相反从句谓语动词用一般过去时，were to +do或者should +do,主句谓语动词用would(should/could/might..)+do.如：

If he were to come here, he would tell us about it. 如果他要来的话，他会通知我们一声。

（教师播放幻灯片5，学生观看幻灯片，在播放过程中给学生讲解if引导错综条件句用虚拟语气的情况。）

有时主句和从句的动作发生的时间不一致，此时，主句和从句的谓语动词要根据各自所指的不同时间选择适当的动词形式。如：

1.If you had worked hard，you would be very tired now. 如果你真的努力工作了，你现在就会感到很累的。(从句指过去，主句指现在) 2. If I had taken the medicine, I would be better now. 如果我服用了那种药的话, 现在就会好些了. （教师播放幻灯片6，学生观看幻灯片，在播放过程中给学生讲解含蓄条件句用虚拟语气的情况。）

有时虚拟条件并不通过条件从句表达出来，而是通过词、短语或上下文暗示有些条件，是由一些短语引出的 (but for, with, without; otherwise, or, but, etc,) ，此时句子的时态要依具体情况而定。如：

Without electricity(＝If there were no electricity)，life would be quite different today. 如果没有电，今天的生活就会完全不同。

I was busy that day. Otherwise I would have gone there with them.(If I hadn’t been busy that day，I would have gone there with them.) 我那天很忙，否则，我就和他们一起去那儿了。 would(should/could/might..)+do

（教师播放幻灯片7，学生观看幻灯片，在播放过程中给学生讲解If省略，句子用倒装的情况。）

若条件句中有were，had，should，可把if 省略，而把were，had，should 放在主语前，形成倒装结构，这种结构主要用于书面语中。如: Had you taken my advice (If you had taken my advice)，you wouldn’t have failed in the examination. 如果你听了我的建议，你就不会考试不及格了。

三、consolidating exercises.

（教师播放幻灯片8，学生探究思考，对所学内容进行强化应用。）

1. If there were no water in the world, everything___ .

A. will die B. would die C. would have died D. would have been dead 2. If I _____ him yesterday I _____ him about it. A. saw; would ask B. had seen; would have asked C. had seen; would ask D. saw; would have asked 3.If I ___ to school tomorrow, I ____ my lessons now. A. were to go; would do B. would go; would do C. went; did

D. should 4. _____ late tomorrow, who would take her place? A. Should Miss Green come B. If Miss Green would come C. Miss Green should come D. If Miss Green comes 5. Without computers, much of today's advanced technology ______ achieved.

A. will not be B. would not be C. would not have been D. cannot have been

6.If you

that late movie last night, you wouldn't be so sleepy.

A. haven't watched B. hadn't watched C. didn't watch D. wouldn't have watched