Conditional sentences type III / شرطی نوع سوم

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building blocks Third Conditional Introduction

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.

The structure of a third conditional sentence

Like the other conditionals, a third conditional sentence consists of two clauses, an “if” clause and a main clause:

IF clausemain clauseIf I had studied harder, I would have passed the exam.

Explanation: I failed the exam, because I didn't study hard enough.

If the “if” clause comes first, a comma is usually used. If the “if” clause comes second, there is no need for a comma:

main clauseIF clauseI probably would have passed the exam if I had studied harder.

We use different verb forms in each part of a third conditional:

IF clause if + subject + past perfect verb* main clause subject + would (OR could, OR might) have + past participle

*The past perfect is formed with the auxiliary verb “had”, and the past participle (or third form) of the verb.

Note also that third conditional forms can be contracted:

Full form If I had studied harder, I probably would have passed the exam. Contracted form If I'd studied harder, I probably would've passed the exam.


Using the third conditional

The third conditional 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:

ExampleExplanationIf you had driven more carefully, you would not have had an accident. Criticism: You had an accident because you didn't drive carefully enough. If we had played a little better, we could have won the game. Regret: We didn't play well, so we lost the game. If you had saved your money, you could have bought a computer. Criticism: You didn't save your money, so now you can't afford a computer. If it had snowed, we could have gone skiing. Regret: It didn't snow, so we couldn't go skiing.


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