如果昨天和前天的知識點你都理解了，那今天的這個知識點對於你來說就是a piece of cake（小菜一碟）了。
所謂條件句倒裝，通常就是把原來 If 句子裡的這幾個詞：were，should，had提到句首，然後去掉 If,以達到強調或突出的目的。
倒裝的感覺
舉幾個例子就一目瞭然了：
1. 與過去事實相反
- 正常語序：If he had come yesterday, I would have told him about it.
- 倒裝語序：Had he come yesterday, I would have told him about it.
如果他昨天來的話，我會告訴他這件事的。
- 正常語序：If he had not been ill and missed many classes, he would have made greater progress.
- 倒裝語序：Had he not been ill and missed many classes, he would have made greater progress.
如果他沒有生病缺課，他會取得更大的進步。
總結：Had 提前，去掉 if，其他不變
2. 與現在事實相反
- 正常語序：If I were president, I wouldn't say those stupid things.
- 倒裝語序：Were I president, I wouldn't say those stupid things.
如果我是總統我是不會說那些蠢話的。
- 正常語序：If I were you，I would not tell him the truth.
- 倒裝語序：Were I you, I would not tell him the truth.
如果我是你，我就不會告訴他真相。
總結：Were 提前，去掉 if，其他不變
3. 與將來事實相反
- 正常語序：If I should win the lottery, I would buy a house.
- 倒裝語序 ：Should I win the lottery, I would buy a house.
如果(將來某天)我中了彩票，我就買一棟房子。
- 正常語序：If it should rain tomorrow, you could stay at home.
- 倒裝語序：Should it rain tomorrow, you could stay at home.
如果明天下雨，你可以呆在家裡。
總結：Should 提前，去掉 if，其他不變
好啦，第16天的內容就是這些，希望你懂了。
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