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选修6《Using LanguageⅠ》优质课PPT课件下载
would/could/should/might+ V原
过去
were to do
should +V原
对将来
would/could/should/might+ have done
过完
对过去
would/could/should/might+ V原
过去
对现在
主句
if 从句
虚拟
例句：
1.如果我是一只小鸟，现在我就可以在天上飞了。（这显然是不可能发生的事情，所以用虚拟语气）
If I were a bird, I could fly in the sky now.
2. 如果妈妈没有叫醒我，我今天早上就会睡过头。
If my mother hadn’t waken me up, I would have overslept this morning.
3. 如果明天下雨的话，我们就不能去郊游了。
If it snowed tomorrow, we couldn’t go outing.
were to snow
should snow
Fill in the blanks
1. If I （be）not busy, I would help you.