As we know, there are four types of conditional sentences. They are: Zero Conditional Sentences, First Conditional Sentences, Second Conditional Sentences, Third Conditional Sentences. In this episode, we are going to discuss the Third Conditional Sentences (Conditional Sentences Type 3).
1. The Use of Conditional Sentences Type 3
Conditional Type 3 is used to talk about impossible situations in the past. It expresses a hypothetical situation that didn’t happen and its potential consequence.
Expressing Imagined Past Situations
- If he had played well last night, We would have won the football match.
- If you had come to the party last night, you would have seen Sue.
- If I hadn’t gone to Oslo a few years ago, I would not have met my wife.
- If I had known that you were ill, I would have gone to see you.
- He wouldn’t have had an accident if he hadn’t driven his car carelessly.
“Would have + past participle” in the Main Clause
You use the main clause to express the potential outcome. The structure: “would have + past participle”.
See the following past participles:

Implications of regret
Type 3 conditionals often convey a sense of regret or disappointment about something that didn’t happen.
2. Pattern of Conditional Sentences Type 3
Sub Clause (If Clause/Conditional Clause) |
Main Clause |
If + Past Perfect Tense If + Subject + had + Verb III |
Subject + would + have + Verb III |
Conditional Sentences Type 3 Exercise
Exercise I
- The accident wouldn’t have happened if the driver (didn’t stop, hadn’t stopped, stopped) suddenly.
- If she had had enough money, she (would buy, would have bought, bought) the diamond ring.
- If she hadn’t cheated in the match, she (would not be disqualified, would not have been disqualified, was disqualified).
- If all of the passengers had put on a life-jacket, a lot of them (wouldn’t die, wouldn’t have died, didn’t die) when the boat capsized last week.
- He (wouldn’t be, wouldn’t have been, was not) ill if he hadn’t gone out in the rain.
Exercise II
Write a conditional sentence type III base on the situations given.
Example:
Situation: There was a football match last Sunday. You didn’t watch it because you didn’t know it.
You write: If I had known (there was a football match last Sunday), I would have watched it.
- There was a good movie last night. You didn’t know it, so you didn’t watch it.
- Your old friend was in town yesterday. You didn’t invite him to dinner because you didn’t know about it.
- My special girlfriend needed a screen protector. You didn’t buy it for her because you didn’t know about it.
- It rained last night. My mother didn’t bring an umbrella with her because the weather was fine.
- I was starving last night. There was no food in the fridge.
Answers
Exercise I
- The accident wouldn’t have happened if the driver hadn’t stopped suddenly.
- If she had had enough money, she would have bought the diamond ring.
- If she hadn’t cheated in the match, she would not have been disqualified.
- If all of the passengers had put on a life-jacket, a lot of them wouldn’t have died when the boat capsized last week.
- He wouldn’t have been ill if he hadn’t gone out in the rain.
Exercise II
- If I had known (there was a good movie last night), I would have watched it.
- If I had known (my old friend was in town), I would have invited him to dinner.
- I would have bought a scree protector for my special girlfriend if I had known she needed one.
- My mother would have brought an umbrella with her if the weather hadn’t been fine.
- I wouldn’t have been starving last night if there had been some food in the fridge.
Conditional Sentences Type III Video
Conditional Sentences Type 3 Animated Lesson
English “If” Conditional – Type 3
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