教甄◆英文科題庫下載題庫

if假設句三大分類

1.現在與未來都可能發生

用法：(if+現在簡單式,現在簡單式/未來簡單式/原V)

例子：If you want to have good grades,study hard!

2.假設的句子與現在事實相反

用法：(if+過去簡單式,could/would/should/might+原v)

例子：If I were you,I would do the right things.

3.假設的句子與過去事實相反

用法：(if+過去完成式,could/would/should/might+have pp)

例子：If you had worked hard,you could have earned much money.

此題為第三類

 The doctor said that the man could have been rescued if he _____ from the rescue team. 

題幹為could have pp,因此if後為過去完成式。