First Conditional: Talking About Real Future Possibilities

Use the first conditional to talk about a future situation you consider possible and what will happen if that condition is met. A common pattern is if + present simple, followed by will + base verb: “If the weather is good, we'll have a picnic.” The present form after if can refer to the future.

Find the condition and the result

The if-part gives the condition. The other part gives the expected result, decision or promise. You are presenting a real possibility from your point of view; the grammar does not guarantee that the condition will happen.

Use the present form after if

For this basic future-condition pattern, say “If it rains”, not “If it will rain”. Then use will for the result: “If it rains, we'll stay inside”. With he, she or it, remember the present simple ending where needed: “If she arrives early, we'll start at ten”.

Write the base verb after will: “will start”, not “will starts”. In speech and informal writing, contractions are common: I'll, you'll, he'll, she'll, we'll and they'll.

Will has other uses as well. Will and going to explains a related choice when discussing the future.

Change the order

You can put the condition first: “If I have time, I'll call you.” A comma normally separates the opening if-clause from the main clause.

You can also put the result first: “I'll call you if I have time.” In this order, a comma is normally unnecessary. The meaning stays the same; only the order changes.

Read both versions aloud and identify the condition. Do not choose will based only on which half appears first. The if-clause still uses the present form in these examples.

Make negative conditions and results

• Negative condition: “If I don't finish by five, I'll call you.”

• Third-person negative: “If she doesn't reply, we'll ask someone else.”

• Negative result: “If the shop is closed, we won't buy the tickets there.”

• Two possible plans: “If it's sunny, we'll go out. If it rains, we'll play a game at home.”

Won't is the usual contraction of will not. After don't or doesn't, use the base verb: “doesn't reply”, not “doesn't replies”. The negative can belong in the condition, the result or both, depending on your meaning.

Use the pattern in an exchange

Try this conversation: “Would you like to come for a walk tomorrow?” “Yes. What if it rains?” “If it rains, we'll meet at the café instead.” “Great. I'll message you if my plans change.”

Inviting someone and responding gives more phrases for this kind of exchange. You can also compare a conditional plan with present continuous for future arrangements: “We're meeting at ten” describes an arrangement, while “If you're free, we'll meet at ten” makes it depend on a condition.

Notice other possible result forms

Will is a useful starting point, but not every real future condition uses it. “If you finish early, you can join us” gives an available option. “If you need help, call me” gives an instruction. Start with the will pattern here, then notice these alternatives in context.

The British Council guide to conditionals offers a reference explanation. Avoid turning the beginner pattern into a claim that will can never appear anywhere after if; English has other constructions and meanings.

Make three plans of your own

Write one sentence about weather, one about travel and one about studying. Give each a possible condition and a realistic result. For example: “If I have ten minutes after dinner, I'll review my notes.”

Then ask a partner what they will do if a plan changes. Use polite opinion phrases when discussing alternatives. Check that both people can identify the condition and understand the next action.