Third Conditional (in english language)

• Third Conditional

• 
• Use the third conditional for impossible situations in the past. You can also use the third conditional for regrets about past actions.

  
  

  If + past perfect, + would/could + have + past participle

  -If she had studied more, she would have passed the exam.

  (This shows an impossible situation because she can't study more.  She already took the exam.)

  
  

  -If I had studied more, I would have passed the exam.

  (This shows regret because the person is upset they didn't study more and failed the exam.)
•  Click on the play button to hear the audio

• If I had seen the thief, I would have called the police.	I would have helped if you had asked!*
  If you had called the restaurant earlier, you could have gotten a reservation.	He could have won the lottery if he had bought a ticket.

• *Remember! You don't need a comma (,) if would/could have comes first in the sentence.

 Source : Alison