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必修5《Grammar Summary》最新PPT课件优质课下载
3. 这些特点决定了它必须使用不同于真实句的动词形式。
虚拟语气在条件状语从句中的用法。
条件从句
If 从句的谓语形式
主句的谓语形式
现在
过去
将来
一般过去时
过去完成时
would/could/should/might +V.（原）
would/could/should/might+have+p.p.
1.一般过去时
2. were to do
3.should+V 原
would/could/should/might +V原
1.If I had H1N1, I would know because I would feel sick and have a fever.
2.If I were you, I would give AIDS patient a hug.
3. If I had taken your advice, I wouldn’t have made a mistake.
4. If he had been there, it wouldn’t have happened.
（与现在事实相反）
（与过去事实相反）
5.If it should rain tomorrow, they wouldn’t go for an outing.
6.I think we could do it, if we planned it properly and could borrow the tools.
7. If we were to have three days off , we would enjoy a very happy life.