We make the third conditional by using the past perfect after 'if' and then 'would have' and the past participle in the second part of the sentence:

if + past perfect, ...would + have + past participle

Examples:

• If she had studied, she would have passed the exam.

• If I hadn't eaten so much, I wouldn't have felt sick.

• If we had taken a taxi, we wouldn't have missed the plane .

More examples:

• She wouldn't have been tired if she had gone to bed earlier.

• She would have become a teacher if she had gone to university.

• He would have been on time for the interview if he had left the house at nine.

THANK YOU!