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Conditionals

The Third Conditional: Conditional Sentences Type 3 Structure & Examples

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Published on by Grammargeek
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B1 EnglishB2 English
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When you are talking about something which is impossible, you will need to use the third conditional. This is something which is frequently used in the English language and we can see an example of this in the sentence β€˜If I had wings, I could fly.’

In this post, we are going to be examining the third conditional much more closely and gaining a greater understanding of how it is used and why. This will enable you to speak about a wider range of things in a theoretical sense, making your English sound much more fluent.

What Is the Third Conditional?

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Third Conditional – Created by 7ESL

Like the other conditionals, a Conditional Sentences Type 3 sentence consists of two clauses, an β€˜ifβ€˜ clause and a main clause. We use different verb forms in each part of a Conditional Sentences Type 3:

Third Conditional Structure: IF +Past Perfect, Subject + would/could/might + have + Past Participle.

Third Conditional examples:

  • If I had got a gold medal, I would have been happy.
  • If I had met Susan last week, I would have given her the book.
  • If the weather had been good, we would have gone water-skiing.

If the β€˜ifβ€˜ clause comes first, a comma is usually used. If the β€˜ifβ€˜ clause comes second, there is no need for a comma.

For example:

  • We would have gone water-skiing if the weather had been good.

Note also that Conditional Sentences Type 3 forms can be contracted.

For example:

  • Full form: If you had got up earlier, you would have caught the earlier train.
  • Contracted form: If youβ€˜d got up earlier, you wouldβ€˜ve caught the earlier train.

How to Use the Conditional Sentences Type 3

The Conditional Sentences Type 3 is used to talk about things which did not happen in the past. If your native language does not have a similar construction, you may find this a little strange, but it can be very useful. It is often used to express criticism or regret.

For example:

  • If Mark had come on time, he would have met them. (Regret)
  • If Charlene hadn’t been so careless, she wouldn’t have lost all money. (Criticism)
  • If you hadn’t lied, you wouldn’t have ended up in prison. (Criticism)
  • If you had asked her, she would have helped you. (Regret)

Related terms:

Conditionals in English

B1 Knowledge Check Β· 5 questions

Third Conditional Practice Quiz (B1-B2)

1 / 5
Q1

Question 1: If she had studied harder, she ___ the exam.

Question 1 options
'would have passed' is correct because the third conditional requires 'would + have + past participle' in the main clause. 'would pass' belongs to the second conditional. 'had passed' is past perfect, used only in the if-clause. 'has passed' is present perfect, which does not fit a past unreal situation.
Q2

Question 2: Which situation is the third conditional most suitable for?

Question 2 options
'Expressing regret about something that did not happen in the past' is correct because the third conditional describes unreal or impossible past situations and is often used to show regret or criticism. It does not describe present habits, future plans, or repeated real events.
Q3

Question 3: A: 'Why didn't you tell me about the meeting?' B: 'Sorry! If I ___ about it, I would have told you straight away.'

Question 3 options
'had known' is correct because the speaker is referring to a past situation that did not happen, requiring the past perfect in the if-clause of the third conditional. 'knew' is simple past used in the second conditional. 'would have known' cannot be used in the if-clause. 'have known' is present perfect and does not fit this past hypothetical context.
Q4

Question 4: If the doctor had arrived sooner, the patient ___.

Question 4 options
'might have survived' is correct because the third conditional main clause can use 'might have + past participle' to express a less certain possible result in the past. 'might survive' and 'might be surviving' do not use the correct perfect form required after a past unreal condition. 'had survived' is past perfect, which belongs in the if-clause only.
Q5

Question 5: Match each sentence to the correct grammar label.

Question 5 options
If you had told me the truth, I wouldn't have been so angry.
If I had known about the sale, I could have saved a lot of money.
If they had hired more staff, they might have finished the project on time.
We would have visited the museum if it hadn't been closed.
Third conditional expressing possibility
Third conditional with main clause first (no comma)
Third conditional expressing criticism
Third conditional expressing regret

Select an item on the left, then tap its match on the right.

The third conditional uses past perfect in the if-clause and 'would/could/might + have + past participle' in the main clause to discuss unreal past situations, including regret, criticism, and possibility.

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