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选修6（2005年6月第1版）《Section 3： GRAMMAR IN USE》公开课PPT课件优质课下载
a. 真实条件句 表示条件是真的或有可能实现的, 采用陈述语气。
b. 虚拟条件句 表示条件是无法实现或几乎无法实现的, 采用虚拟语气。
(The Subjunctive Mood)表示说话人所说的话不是事实,而是一种假设, 愿望, 怀疑或推测.虚拟语气主要用于if条件状语从句,也可用于名词性从句等.
1. 虚拟语气用以表示假定，想象，愿望等非事实的观念。
2. 虚拟条件从句中的条件是假设的，因此主句的结论也只能是想象的，非事实的。
3. 这些特点决定了它必须使用不同于真实句的动词形式。
虚拟语气的特点
二. ‘if ’虚拟条件句的概念
由 ‘if’ 引导的虚拟条件句叫作 ‘if’虚拟条件句
I could easily recognize if I had seen him before.
其他虚拟条件句
Without your help, I couldn’t have finished my work on time.
三. if Sentence Structure ‘if ’虚拟条件句的结构
a. 表示与现在事实相反 的假设
b. 表示与过去事实相反 的假设
c. 表示与将来事实相反 的假设
If he got up early,
he would be on time.
If I had a lot of money
I would buy a villa.
What would you do if you won the lottery?
If I won the lottery, I would…
If I won the lottery, I would buy an expensive car.
If he had driven more carefully, he would not have had the car accident yesterday.
If I had learnt how to swim,