Virtuous English Academy
The First Conditional in English (A2)
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- #Grammar
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The first conditional (If + present simple, will + verb) talks about real and likely future situations and their results. This lesson shows how to form it and when to use it.
The first conditional talks about a real possibility in the future and its likely result. If it rains, we will cancel the picnic. The condition has not happened yet, it might well happen, and you are stating what will follow if it does. This makes it the conditional of plans, warnings, promises and negotiations.
The structure is if plus the present simple, followed by will plus the base verb. The single most important rule is that will does not appear in the if clause. If it will rain is wrong; If it rains is correct. English uses a present form to talk about the future inside the condition, which surprises speakers of many other languages.
The result clause is flexible. Instead of will you can use may or might for less certainty, can for possibility, should for advice, or an imperative for instructions. The if clause stays in the present simple throughout, which keeps the pattern easy to control.
How to form The First Conditional
| Part | Form | Example |
|---|---|---|
| Condition | if + present simple | If you study hard, |
| Result | will + base verb | you will pass the exam. |
| Reversed order | result + if + condition | You will pass if you study hard. |
| Less certain result | may / might + base verb | If you hurry, you might catch it. |
| Instruction result | imperative | If you see him, tell him to call me. |
| Advice result | should + base verb | If you feel ill, you should rest. |
| Negative condition | if + don't/doesn't | If it doesn't rain, we'll walk. |
The First Conditional: the key rules
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Form: If + present simple, will + base verb — for real future possibilities.
If it rains tomorrow, we'll stay in.
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The if-clause stays in the present even though the meaning is future.
If she passes the exam, she'll celebrate.
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Unless means if…not.
Unless you hurry, you'll miss the bus.
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Might, can and imperatives can replace will in the result.
If you're free later, call me.
When to use The First Conditional
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Plans that depend on something
The most common use — making arrangements conditional on circumstances.
If the train is on time, we'll be there by six.
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Warnings and consequences
Telling someone what will happen if they do or do not act.
If you don't leave now, you'll miss the flight.
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Promises and offers
Committing to something in exchange for a condition being met.
If you help me today, I'll buy you dinner.
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Negotiating and bargaining
Both halves state what each side will do — extremely common in work contexts.
If you lower the price, we'll order twice as much.
if vs. unless
Unless means if not, and using it removes the need for a negative in the condition.
if + negative
States the condition negatively using don't or doesn't.
If you don't hurry, you'll be late.
unless + positive
Carries the negative itself, so the verb after it stays positive. Means the same thing.
Unless you hurry, you'll be late.
The First Conditional in example sentences
- If I finish early, I'll call you.Present simple in the condition, will in the result.
- We'll wait if the traffic is bad.Reversed order — no comma.
- If you don't book now, the price will go up.Negative condition with a warning.
- If she applies, she might get the job.might for a less certain result.
- If you see Marek, give him this.Imperative in the result clause.
- Unless it snows, the roads will be clear.unless replaces if not.
- I'll help you if you ask me.A conditional promise.
- If the shop is closed, we can try another one.can for possibility in the result.
The First Conditional in a real conversation
Notice that will never appears after if, no matter how clearly future the meaning is.
Client:If we sign this week, will you reduce the fee?
Consultant:If you commit to twelve months, I'll take ten per cent off.
Client:And if the project runs late?
Consultant:Unless the delay is on our side, the original rate applies.
Client:If I speak to my director today, we might decide by Friday.
Consultant:That works. If you email me, I'll send the contract straight away.
Common mistakes (and how to fix them)
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If it will snow, the school will close.
If it snows, the school will close.
Will never enters the if-clause — the present simple carries the future meaning there.
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If you don't unless study, you'll fail.
Unless you study, you'll fail.
Unless already means 'if not' — combining both doubles the negative.
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If he'll arrive early, we can start.
If he arrives early, we can start.
Same law: no will after if.
Practise The First Conditional today
The if clause is where the error lives, so check every one for a stray will.
- Write four plans for next weekend that depend on the weather.
- Write three warnings and three promises using the first conditional.
- Rewrite three if not conditions using unless.
- Correct these: If it will rain, we stay in. — If you will help me, I finish faster.
The First Conditional: frequently asked questions
Why can I not use will after if?
Because English marks the future only once in a conditional sentence, and it does so in the result clause. The if clause uses a present form even though the meaning is clearly future — the same thing happens after when, as soon as, before, after and until: I'll call you when I arrive, not when I will arrive. Treat all these time and condition words as blocking will.
What is the difference between the first and second conditional?
Probability. The first conditional describes something realistically possible: If I get the job, I'll move to Berlin — you have applied and might succeed. The second describes something unlikely or imaginary: If I won the lottery, I would move to Berlin. The second conditional uses a past form in the if clause and would in the result, and it signals that you do not really expect it to happen.
How exactly does unless work?
Unless means if not, so the verb after it stays positive: Unless you hurry, you'll be late is equivalent to If you don't hurry, you'll be late. The most common error is doubling the negative — Unless you don't hurry reverses the meaning. Note that unless does not work in every if not context, particularly with hypothetical or emotional conditions, so if not is the safer general choice.
Can I use something other than will in the result?
Yes, and it is very common. Use may or might when the result is uncertain, can when it is a possibility or permission, should for advice, and the imperative for instructions: If you finish early, start the next section. The if clause stays in the present simple in every case, so only the result clause changes.