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必修4《Grammar》公开课PPT课件优质课下载
条件从句
If 从句的谓语形式
主句的谓语形式
过去
现在
将来
had done
would/could/should/might + have done
would/could/should/might +V.
1. did
2. should+ V.
3. were to do
would/could/should/might +V.
1. If 型
did
1. 如果我是你，我会再试一次。
If I ______you, I __________ it again. (现在)
2. 如果昨天我见到你了，我会问你关于它的事情。
If I ________ you yesterday, I __________________ you about it. (过去)
3. 如果明天下雪的话，他们不会出去。
If it _____________ tomorrow, they __________ for an outing. (将来)
were
would try
had seen
would have asked