`1.` Had I realised what would happen, I wouldn't have accepted the job.

`-` Câu điều kiện loại `3` : If S + had P2 , S + would/could/might + have P2

`=>` Had + S1 + (not) + past participle, S2 + would/might/could… + have + past participle

`2.` Were the government to raise interested rates, they would lose the election.

`-` Were + S + (not) + to-inf, S + would/could/might + Vinf + O

`3.` Had they carried a compass, they would have discovered land sooner

`-` Câu điều kiện loại `3` : If S + had P2 , S + would/could/might + have P2

`=>` Had + S1 + (not) + past participle, S2 + would/might/could… + have + past participle

12. If I had realised what would happen, I wouldnt have accepted the job .

⇒ Had I realized what would happen, I wouldn't have accepted the job.

13. If the government raised interest rates, they would lose the election 

⇒Were the government to write interest rates they would lose the election.

→ cấu trúc câu đảo ngữ điều kiện loại 2 : $were+S+toV...,S+would+V_{0}$ 

14. If they had carried a compass, they would have discovered land sooner

⇒  Had they carried a compass, they'd have discovered land soon

$had+S+V_{3/ed}$ $S+would+have+V_{3/ed}$