Conditionals: revision Practice Tests with B2 Grammar Rules & Examples

Conditionals: Revision

Conditionals are sentences with two parts: a condition (the "if" part) and a result (what happens because of that condition). We use conditionals to talk about possibilities, hypothetical situations, regrets, and consequences. English has several types of conditional sentences, and at B2 level it is important to understand how each one works and when to use it.

In this lesson, we will revise all the main conditional structures — Zero, First, Second, and Third — as well as the Mixed Conditional, which combines elements from different types. We will look at their forms, meanings, and common mistakes.

Here are some quick examples to get started:

• If you heat water to 100°C, it boils. (Zero Conditional — general truth)
• If it rains tomorrow, I will stay at home. (First Conditional — real possibility)
• If I had more time, I would learn the piano. (Second Conditional — unreal present)
• If she had studied harder, she would have passed the exam. (Third Conditional — unreal past)
• If I had saved more money, I would be travelling the world now. (Mixed Conditional)

The Zero Conditional

Meaning

We use the Zero Conditional to talk about things that are always true — scientific facts, general rules, and habits. Both parts of the sentence describe something that is always the result of the condition.

Structure

If + present simple, present simple

The word when can often replace if in Zero Conditionals without changing the meaning significantly.

If clause (condition)	Result clause
If you freeze water,	it turns to ice.
If people don't sleep enough,	they feel tired.
If the temperature drops below zero,	pipes can burst.
When I drink too much coffee,	I can't sleep.

Key Points

• Use the present simple in both clauses.
• The result is always or generally true.
• Both clauses can come first: Water turns to ice if you freeze it.
• Use a comma after the if clause when it comes first.

The First Conditional

Meaning

We use the First Conditional to talk about real and possible future situations. The speaker believes the condition is realistic — it might genuinely happen.

Structure

If + present simple, will + base verb

We can also use unless, as long as, provided that, and in case instead of if in first conditional sentences.

If clause (condition)	Result clause
If she arrives on time,	we will catch the train.
If you don't hurry,	you will miss the bus.
If it is sunny at the weekend,	they will go to the beach.
Unless you study,	you won't pass the test.
As long as you work hard,	you will succeed.

Variations with Modal Verbs

In the result clause, you can use other modal verbs instead of will to change the level of certainty or to give advice:

• If you ask him, he might help you. (possibility)
• If she calls, you should answer. (advice)
• If it is warm, we can sit outside. (ability/permission)

The Second Conditional

Meaning

We use the Second Conditional to talk about unreal, imaginary, or hypothetical present or future situations. The speaker does not expect the condition to happen, or knows it is not true right now.

Structure

If + past simple, would + base verb

If clause (condition)	Result clause
If I won the lottery,	I would buy a house by the sea.
If she spoke French,	she would apply for the job in Paris.
If we had a bigger car,	we would all travel together.
If he weren't so busy,	he would spend more time with his family.

Special Note: "Were" instead of "Was"

In formal and written English, we use were for all subjects in the second conditional — including I, he, she, and it. In informal spoken English, was is also commonly heard.

• If I were you, I would apologise. (formal/correct)
• If I was you, I would apologise. (informal/spoken)
• If she were taller, she would be a model. (formal)

The phrase "If I were you, ..." is a very common way to give advice.

Variations with Modal Verbs

You can also use could or might in the result clause:

• If I had more experience, I could apply for that position.
• If it stopped raining, we might go for a walk.

The Third Conditional

Meaning

We use the Third Conditional to talk about unreal past situations — things that did not happen. We imagine a different past and think about what the result would have been. It is often used to express regret or to criticise a past action.

Structure

If + past perfect, would have + past participle

If clause (condition)	Result clause
If she had left earlier,	she would have caught the flight.
If they had listened to the advice,	they would have avoided the problem.
If I had known about the meeting,	I would have attended.
If he hadn't been so careless,	he wouldn't have broken his phone.

Variations with Modal Verbs

You can use could have or might have in the result clause:

• If they had practised more, they could have won the tournament.
• If I had checked the map, I might not have got lost.

Contractions in Third Conditionals

In spoken English, we often use contractions. Note these carefully:

• If she'd studied harder, she'd have passed. (she'd = she had in the if clause; she'd = she would in the result)
• They wouldn't have been late if they'd left on time.

The Mixed Conditional

Meaning

A Mixed Conditional combines elements from the second and third conditionals. We use it when the time in the condition clause is different from the time in the result clause. There are two common patterns.

Pattern 1: Past condition → Present result

If + past perfect, would + base verb

This describes a past event that is affecting the present situation.

• If she had studied medicine, she would be a doctor now. (She didn't study medicine in the past, so she isn't a doctor now.)
• If he hadn't moved abroad, he would still be living here.
• If I hadn't taken that job, I wouldn't have met my partner.

Pattern 2: Present condition → Past result

If + past simple, would have + past participle

This describes an unreal present situation and its imagined effect on the past.

• If I were more organised, I would have finished the project by now. (I am not organised, and that is why I haven't finished it.)
• If she were braver, she would have spoken up at the meeting.

Type	If clause	Result clause	Meaning
Mixed 1	Past perfect	would + base verb	Past cause → present effect
Mixed 2	Past simple	would have + past participle	Present cause → past effect

Complete Overview Table

Conditional Type	If Clause	Result Clause	Use	Example
Zero	Present simple	Present simple	General truths and facts	If you mix colours, you get new ones.
First	Present simple	will + base verb	Real future possibilities	If I finish early, I will call you.
Second	Past simple	would + base verb	Unreal present/future situations	If I had wings, I would fly.
Third	Past perfect	would have + past participle	Unreal past situations/regrets	If he had come, he would have enjoyed it.
Mixed (past → present)	Past perfect	would + base verb	Past event affecting the present	If I had slept, I would feel better now.
Mixed (present → past)	Past simple	would have + past participle	Present state affecting imagined past	If she were confident, she would have spoken.

Important Differences and Special Cases

First vs Second Conditional

The difference between the First and Second Conditional is about how likely the speaker thinks the situation is:

• If it rains, I will take an umbrella. (First — I think it might actually rain.)
• If it rained every day, I would move house. (Second — I don't actually expect this to happen; it's hypothetical.)

Unless in Conditionals

Unless means if not. It is used in Zero and First Conditionals.

• Unless you hurry, we will miss the train. = If you don't hurry, we will miss the train.
• Unless it rains, we will eat outside. = If it doesn't rain, we will eat outside.

Do not use unless in Third Conditionals. Use if ... hadn't instead.

Other Conditional Linkers

Instead of if, you can use other expressions to introduce conditions, especially in First Conditionals:

• Provided (that) / Providing (that): You can borrow the car provided that you fill it up with petrol.
• As long as: I will help you as long as you are honest with me.
• On condition that: He agreed to come on condition that he could leave early.
• In case: Take an umbrella in case it rains. (Note: in case is not exactly the same as if — it means "because something might happen")

Wish vs Conditional

We often use wish to express the same feelings as second and third conditionals. Notice the parallel structures:

• If I were rich, I would travel more. → I wish I were rich.
• If she had told me, I would have helped. → I wish she had told me.

Common Mistakes

❌ If I will see him, I will tell him.
✅ If I see him, I will tell him. (Do not use will in the if clause of a First Conditional.)

❌ If she would study more, she would pass.
✅ If she studied more, she would pass. (Do not use would in the if clause of a Second Conditional.)

❌ If I had known, I would told you.
✅ If I had known, I would have told you. (The result clause in a Third Conditional needs would have + past participle.)

❌ If he didn't lie, she would have trusted him.
✅ If he hadn't lied, she would have trusted him. (To refer to an unreal past event, use the past perfect in the if clause.)

❌ Unless you don't hurry, you'll be late.
✅ Unless you hurry, you'll be late. (Unless already means if not — do not add another negative.)

❌ If I was a bird, I would fly to you. (formal writing)
✅ If I were a bird, I would fly to you. (Use were for all subjects in formal Second Conditionals.)

❌ If she had more confidence now, she would have applied for the job last year. (if the sentence means her current personality explains a past action, the structure is correct as a mixed conditional — but students often confuse the time references)
✅ Check carefully which time each clause refers to before choosing your conditional type.

Conditionals: Revision — Quick Summary

• The Zero Conditional uses present simple + present simple for general truths.
• The First Conditional uses present simple + will + base verb for real future possibilities.
• The Second Conditional uses past simple + would + base verb for unreal present or future situations.
• The Third Conditional uses past perfect + would have + past participle for unreal past situations and regrets.
• Mixed Conditionals combine past and present time references when the condition and the result belong to different time frames.
• Never use will or would in the if clause (except in very formal polite requests).
• Unless, as long as, provided that, and in case can replace or extend if with slightly different meanings.
• Use were (not was) for all subjects in formal Second Conditionals.
• The Third Conditional always requires would have + past participle in the result clause — never just would + base verb.

Now practise conditionals in the exercises below.