If Clause rules and examples

If Clause rules and examples in English grammar. Third conditional exercises with answers are given for competitive exam.

In this video we are going to learn impossible condition example. We have explained third conditional exercises and examples.

The third conditional (also called conditional type 3) is a structure used for talking about unreal situations in the past. This page will explain how the third conditional is formed, and when to use it.

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If Clause rules and examples

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If Clause rules and examples in English grammar

The third conditional, also known as type III if-clause, refers to past situations and their outcomes and imagines them as different. It is also known as the impossible conditional because it talks about pasts situation that did not happen.

The third conditional is used to express the past consequence of an unrealistic action or situation in the past.


If he had studied harder, he would have passed the exam.

Third Conditional Rules

1. The condition must be in the past perfect tense.

2. The result must use the modal verb “would” and “have” + past participle form.

3. The third conditional helps talk about hypothetical situations in the past that cannot be changed.

4. The third conditional is often used with regrets or to express a desire to change the past.

Rule 1:

To form the third conditional, we use a past perfect for the if-clause, and would have + past participle for the main clause.


If you had told me about the meeting, I would have come.

If you had told me about the meeting, I wouldn’t have missed it.

Rule 2:

We can use the third conditional to express regrets.


If I had been more confident, I would have asked for a higher salary.

Rule 3:

We can use the third conditional to give feedback and criticize.

Example: This essay would have been better if you had included more examples.

third conditional exercises with answers

1. If she had gone to bed earlier, she __________been tired.

2. She ________become a teacher if she had gone to university.

3. If he had taken the job, he __________moved to another city.

4. If I had left earlier, I __________missed my flight.

5. Now look if you hadn’t been so rude, they ___________invited you back.

6. If I had got a gold medal, I __________been happy.

7. If you had been more careful, you _________had an accident.

8. If I had known you were visiting, I __________ordered food.


1. wouldn’t have

2. would have

3. would have

4. wouldn’t have

5. would have

6. would have

7. wouldn’t have 8. would have