What Are Unreal Conditionals?
English has several types of conditional sentences, and they fall into two broad groups: real (things that are possible or likely) and unreal (things that are imaginary, hypothetical, or contrary to fact). The second, third, and mixed conditionals all belong to the unreal group.
When you use an unreal conditional, you are not describing what actually happens — you are imagining an alternative reality. This makes them powerful tools for expressing wishes, regrets, advice, and speculation.
- Second conditional: imagines a situation that is not true now or is very unlikely in the present or future.
- Third conditional: imagines a situation in the past that did not happen — you are looking back and wondering "what if?"
- Mixed conditional: combines a past unreal condition with a present unreal result, or vice versa.
A good way to remember the difference is to ask yourself: "Is this about now, or about then?" If you are imagining a different present, use the second. If you are reimagining the past, use the third. If the time frames are mixed, you need a mixed conditional.
The words if, unless, as long as, and provided that can all introduce conditional clauses. However, if is by far the most common, and it is the one you should master first.
The Second Conditional (Unreal Present or Future)
The second conditional describes an imaginary or unlikely situation in the present or future and its result. The speaker knows the situation is not real — or considers it so unlikely that it feels unreal.
Structure: If + past simple, would + base verb
The if-clause uses the past simple tense, but notice: this past tense does not refer to the past in time. It is a hypothetical form used to signal unreality. The result clause uses would + the base form of the verb.
If I won the lottery, I would travel around the world. If she had more time, she would learn to play the piano. If it rained tomorrow, we would cancel the picnic. If I were you, I would accept the job offer. What would you do if you could speak any language fluently?
Notice how each sentence describes a situation the speaker considers unreal or hypothetical right now. The person has not won the lottery. She does not have more time. These are imaginary conditions.
You can reverse the order of the clauses without changing the meaning. When the if-clause comes second, you do not use a comma.
If I had a car, I would drive to work. I would drive to work if I had a car.
The second conditional is very natural for giving advice. Saying "If I were you, I would..." is one of the most useful phrases in spoken English. It sounds friendly and indirect — far softer than a direct command.
The Third Conditional (Unreal Past)
The third conditional describes an imaginary situation in the past — something that did not happen — and the result that would have followed. This structure is ideal for expressing regret, relief, criticism, and speculation about past events.
Structure: If + past perfect, would have + past participle
The if-clause uses the past perfect (had + past participle), and the result clause uses would have + the past participle.
If she had studied harder, she would have passed the exam. If we had left earlier, we wouldn't have missed the train. If he had known about the party, he would have come. I would have helped you if you had asked me. If they had invested wisely, they would have made a lot of money.
Each of these sentences describes something that did not happen. She did not study harder, so she did not pass. We did not leave earlier, so we did miss the train. The third conditional lets you replay history and imagine a different outcome.
This tense combination is also common when expressing relief about something that nearly went wrong:
If the doctor hadn't acted quickly, the situation would have been much worse. If I hadn't checked my bag again, I would have left my passport behind.
Be careful with contractions. "Would have" is often reduced in speech to "would've" — never write or say "would of." This is one of the most common written errors in English.
Mixed Conditionals
Mixed conditionals combine elements from the second and third conditionals when the time frame of the condition and the result are different. There are two main types.
Type 1 — Past condition, present result: The imaginary situation is in the past, but its effect continues into the present.
Structure: If + past perfect, would + base verb
If I had studied medicine, I would be a doctor now. If she hadn't moved abroad, she would still live near her family. If he had taken that job offer, he wouldn't be looking for work today. If they had saved more money, they wouldn't be in debt now.
In each case, the if-clause describes something that did not happen in the past, while the result describes the effect on the present moment. Notice "now" and "today" as signals of a present result.
Type 2 — Present condition, past result: An imaginary present situation is applied to a past event. This is less common but equally important.
Structure: If + past simple, would have + past participle
If I were braver, I would have spoken up at the meeting. If she were more patient, she wouldn't have quit so quickly. If he weren't so stubborn, he would have listened to her advice.
Here, the if-clause describes a permanent or ongoing characteristic (being brave, patient, stubborn), while the result describes something in the past that was affected by that characteristic.
When you see a conditional sentence with different time signals in each clause — for example, "now" in one clause and a past event in the other — that is a strong clue that you need a mixed conditional.
Were vs. Was in Conditional Sentences
One of the most frequently debated points in conditional grammar is whether to use were or was in the if-clause. The short answer: in formal and written English, were is the correct choice for all subjects in second conditional and mixed conditional sentences — including I, he, she, and it.
If I were taller, I would play basketball. If she were here, she would know what to do. If it were possible, I would change everything. If he were more careful, he wouldn't make so many errors.
This special form of were is called the subjunctive mood. It signals that a situation is imaginary or hypothetical rather than real. The subjunctive has largely disappeared from modern English, but it remains standard in conditional sentences.
In everyday spoken English, many native speakers — especially in informal American English — use was with singular subjects:
If I was rich, I would live by the sea. If he was here, he'd know what to do.
Both forms are understandable, and using was will not cause confusion. However, for academic writing, professional communication, and language examinations, you should use were. The phrase "If I were you..." is especially fixed — you will almost never hear "If I was you" in any register of careful English.
A reliable rule: whenever you see "as if" or "as though" followed by an imaginary comparison, always use were — "He talks as if he were an expert." This is standard in all registers.
Would, Could, and Might in the Result Clause
The result clause of a conditional sentence does not have to use would. You can also use could and might to express different degrees of certainty or ability, and this gives your language more nuance and precision.
Would expresses a certain or definite result — given the condition, this is what would happen:
If I had more money, I would buy a larger apartment. If she had asked, I would have helped her immediately.
Could expresses ability or possibility — the result is possible, not guaranteed:
If I had more money, I could buy a larger apartment (it would be possible). If she had practised more, she could have won the competition. If you took a different route, you could avoid the traffic.
Might expresses a weaker possibility — the result is uncertain, just one of several outcomes:
If I had more money, I might buy a larger apartment (but I'm not sure). If she had studied abroad, she might have found a better job. If you asked him nicely, he might agree.
The same pattern applies to the third conditional and mixed conditionals. You can replace would have with could have or might have in the result clause to soften the certainty of the imagined outcome.
Think of these modals on a scale: would (most certain) → could (possible) → might (uncertain). Choosing the right one makes your English more precise and expressive.
Common Mistakes to Avoid
Even advanced learners make predictable errors with conditionals. Here are the most common ones — read them carefully, because recognising mistakes in someone else's writing helps you avoid them in your own.
Mistake 1: Using "would" in the if-clause
This is the single most common error. The word would belongs in the result clause, not the if-clause.
✗ If I would have more time, I would read more. ✓ If I had more time, I would read more. ✗ If she would have studied, she would have passed. ✓ If she had studied, she would have passed.
Mistake 2: Writing "would of" instead of "would have"
In fast speech, would have sounds like would've — and some learners write this as would of. This is always incorrect in writing.
✗ I would of helped you if you had asked. ✓ I would have helped you if you had asked.
Mistake 3: Using the present simple instead of the past simple in second conditionals
✗ If I have more money, I would travel more. ✓ If I had more money, I would travel more.
Mistake 4: Confusing second and third conditionals
Remember: the second conditional is about now or the future; the third is about the past. Mixing the structures creates an incoherent sentence.
✗ If I had studied medicine, I would be became a doctor. (mixed wrongly) ✓ If I had studied medicine, I would be a doctor now. (correct mixed) ✓ If I had studied medicine, I would have become a doctor. (correct third)
Mistake 5: Forgetting "have" in the third conditional result clause
✗ If she had arrived earlier, she would met him. ✓ If she had arrived earlier, she would have met him.
A quick self-check: in the third conditional, both clauses need a form of "have" — had in the if-clause and would have / could have / might have in the result clause. If you are missing one, something is wrong.
Frequently Asked Questions
What is the difference between the second and third conditional?
The second conditional imagines an unreal or unlikely situation in the present or future (If I had more time, I would learn guitar). The third conditional imagines a situation in the past that did not actually happen (If I had had more time, I would have learned guitar). The key difference is time: second = now or future, third = past.
Can I use 'was' instead of 'were' in the second conditional?
In formal and written English, 'were' is the correct choice for all subjects, including 'I', 'he', and 'she' (If I were you; If she were here). In informal spoken English, 'was' is commonly used and widely understood. For exams and professional writing, always use 'were'.
What is a mixed conditional?
A mixed conditional combines a condition in one time frame with a result in a different time frame. The most common type has a past condition with a present result: 'If I had taken that job, I would be living abroad now.' The if-clause uses the past perfect; the result clause uses would + base verb.
Can I use 'could' or 'might' instead of 'would' in conditionals?
Yes. 'Would' expresses a certain result, 'could' expresses possibility or ability, and 'might' expresses a weaker, more uncertain possibility. All three are grammatically correct. Choosing the right modal makes your meaning more precise: 'I would go' (definite), 'I could go' (possible), 'I might go' (uncertain).
Why is it wrong to say 'If I would have more time'?
'Would' belongs in the result clause, not the if-clause. The if-clause of a second conditional uses the past simple: 'If I had more time, I would...' The if-clause of a third conditional uses the past perfect: 'If I had had more time, I would have...' Never put 'would' in the if-clause.
How do I know whether to use a second or third conditional?
Ask yourself: is the imaginary situation about now/the future, or about the past? If you are imagining a different present reality, use the second conditional (If I lived in Paris...). If you are reimagining something that already happened, use the third conditional (If I had lived in Paris when I was young...).