Look at these examples to see how third and mixed conditionals are used.
We would have walked to the top of the mountain if the weather hadn't been so bad.
If we'd moved to Scotland when I was a child, I would have a Scottish accent now.
If she was really my friend, she wouldn't have lied to me.
Try this exercise to test your grammar.
- Grammar test 1
Read the explanation to learn more.
Grammar explanation
Do you know how to use third and mixed conditionals?
Third conditionals and mixed conditionals
Conditionals describe the result of a certain condition. The if clause tells you the condition (If I hadn't been ill) and the main clause tells you the result (I would have gone to the party). The order of the clauses does not change the meaning.
If I hadn't been ill, I would have gone to the party.
I would have gone to the party if I hadn't been ill.
Conditional sentences are often divided into different types.
Third conditional
The third conditional is used to imagine a different past. We imagine a change in a past situation and the different result of that change.
If I had understood the instructions properly, I would have passed the exam.
We wouldn't have got lost if my phone hadn't run out of battery.
In third conditional sentences, the structure is usually: If + past perfect >> would have + past participle.
Mixed conditionals
We can use mixed conditionals when we imagine a past change with a result in the present or a present change with a result in the past.
1. Past/Present
Here's a sentence imagining how a change in a past situation would have a result in the present.
If I hadn't got the job in Tokyo, I wouldn't be with my current partner.
So the structure is: If + past perfect >> would + infinitive.
2. Present/Past
Here's a sentence imagining how a different situation in the present would mean that the past was different as well.
It's really important. If it wasn't, I wouldn't have called you on your holiday.
And the structure is: If + past simple >> would have + past participle.
Do this exercise to test your grammar again.
- Grammar test 2
Hello Im1300,
No, I'm afraid not. I'd suggest you read the explanation and study the examples on this page to learn more about this. If you have any questions about specific sentences after that, please feel free to ask us.
All the best
Kirk
The LearnEnglish Team
Hello Isuru0775520379
Your example sentences are grammatically correct, though they mean something different than the same sentences with 'would' -- 'might' and 'could' can both indicate possibility, and 'could' can also indicate ability.
Does that help?
All the best
Kirk
The LearnEnglish Team
Hello Ahmed Imam,
The sentence is not correct. We use unless to describe things that we are not sure of, not to describe things that we know are true or not true. Since we know that Shakespeare moved to London, we would use if...not and not unless.
Peter
The LearnEnglish Team
Hello again Vitub,
Before we look at your particular example, you need to make sure that thes structures you are looking at are the same. You need to check if the to is part of an infinitive or is a preposition, for example, and if it is an infintive whether or not it is functioning as a verb in the sentence or is being used as the subject or object of the clause in the same way that a gerund can be.
All that said, let's look at your example.
In this example, to be different is used as a concept, not an action. In other words, it functions as the subject of the verb is. You could put quotes around it to make this clearer:
You could also replace it with a gerund:
In other words, you do not have a verbal expression here, but an infinitive functioning as the subject of the sentence. Infinitives are often used this way:
Generally, the infinitive form in these constructions is more conceptual, equivalent to saying 'the idea of....'. The gerund is more concrete, describing actual actions.
The other example you quote (about calculating work duration) does not appear to me to be correct English. I have no idea who the author is and if they are a fluent English speaker, or even if they typed what they intended. This is why finding examples online in forums and treating them as a good source is not a sensible approach. Examples in published materials from reputable publishers, such as the Cambridge Plato translation, are far better.
Peter
The LearnEnglish Team