Future Clauses Practice Tests with B1 Grammar Rules & Examples

Future Clauses in English

When we talk about the future in English, we often use two parts in one sentence. One part describes a condition or time, and the other part describes what will happen. These two-part sentences are called future clauses.

Future clauses are very useful in everyday English. We use them to talk about plans, conditions, and what will happen when something else happens first.

Here are some simple examples:

• If it rains, I will stay at home.
• When she arrives, we will have dinner.
• I will call you before I leave.

In this lesson, you will learn how to build these sentences correctly, avoid common mistakes, and use future clauses with confidence.

What Are Future Clauses?

A clause is a group of words that contains a subject and a verb. A sentence with a future clause has two clauses joined together:

• The main clause – this tells us what will happen (uses will + verb)
• The time or condition clause – this tells us when or under what condition it will happen

The time or condition clause usually starts with a special word called a conjunction. A conjunction is a joining word. Common conjunctions used in future clauses include:

• if – for conditions
• when – for time
• before – for time
• after – for time
• as soon as – for time
• until – for time
• unless – for negative conditions

The Most Important Rule

Here is the key rule for future clauses in English. Many learners make a mistake here, so read this carefully.

In the time or condition clause, we do NOT use "will". We use the present simple tense instead.

Look at this example:

❌ When she will arrive, we will eat dinner.
✅ When she arrives, we will eat dinner.

The sentence is about the future, but after when, we use arrives (present simple), not will arrive.

This is the most important rule to remember:

Time/condition clause → present simple
Main clause → will + verb

Future Clauses with "If"

We use if to talk about a possible future condition. This is sometimes called the first conditional. We use it when something is possible or likely to happen.

Pattern:

If + subject + present simple, subject + will + verb

Examples:

• If you study hard, you will pass the exam.
• If we miss the bus, we will walk.
• If she calls me, I will answer.
• If it is sunny tomorrow, we will go to the beach.

Notice that in each sentence, the if clause uses the present simple (study, miss, calls, is), and the main clause uses will + verb (will pass, will walk, will answer, will go).

If Clause (present simple)	Main Clause (will + verb)
If it rains	I will stay at home.
If you are late	we will start without you.
If he works hard	he will get a promotion.
If they don't hurry	they will miss the flight.
If she feels better	she will come to the party.

Future Clauses with "When"

We use when to talk about something that we expect to happen in the future. With when, we are quite sure the event will happen – it is just a matter of time.

Pattern:

When + subject + present simple, subject + will + verb

Examples:

• When I finish work, I will call you.
• When they arrive at the hotel, they will check in.
• When she graduates, she will look for a job.
• When the film starts, please be quiet.

When Clause (present simple)	Main Clause (will + verb)
When I see him	I will tell him the news.
When you get home	please send me a message.
When we have enough money	we will buy a new car.
When the meeting ends	we will have coffee.
When spring comes	the flowers will bloom.

Future Clauses with "Before" and "After"

We also use before and after to talk about the order of events in the future. The same rule applies: use the present simple in the time clause, and will + verb in the main clause.

Pattern with "before":

Subject + will + verb + before + subject + present simple

Examples with before:

• I will call you before I leave the office.
• She will read the contract before she signs it.
• We will eat before the film starts.

Pattern with "after":

Subject + will + verb + after + subject + present simple

Examples with after:

• I will feel much better after I sleep.
• After he finishes university, he will travel the world.
• We will go out after it stops raining.

Conjunction	Full Sentence Example
before	I will have a coffee before I start work.
before	He will call her before he arrives.
after	She will relax after she submits her report.
after	They will celebrate after the team wins.

Future Clauses with "As Soon As" and "Until"

As soon as means "immediately when". We use it to show that one thing will happen very quickly after another.

Examples with as soon as:

• I will text you as soon as I land at the airport.
• As soon as the doctor is free, she will see you.
• He will start the project as soon as he gets the approval.

Until means "up to the point when". We use it to say how long something will continue.

Examples with until:

• I will wait here until you come back.
• She will keep practising until she gets it right.
• We won't leave until everyone is ready.

Conjunction	Meaning	Example Sentence
as soon as	immediately when	I will call you as soon as I know the result.
as soon as	immediately when	As soon as she wakes up, she will check her phone.
until	up to the point when	He will study until the library closes.
until	up to the point when	I won't stop until I finish this chapter.

Future Clauses with "Unless"

Unless means "if not". It introduces a negative condition. We use it to say that something will happen only if the condition is NOT met.

Examples:

• I will come to the party unless I am too tired. (= I will come if I am not too tired.)
• She will fail the exam unless she studies. (= She will fail if she does not study.)
• Unless it snows, the match will go ahead. (= If it does not snow, the match will go ahead.)

Important: Do not use not in the unless clause. Unless already has a negative meaning.

❌ Unless she doesn't call me, I will go alone.
✅ Unless she calls me, I will go alone.

Changing the Order of the Two Clauses

A very useful feature of future clauses is that you can change the order of the two parts. Both orders are correct. However, when the time or condition clause comes first, we usually put a comma between the two parts.

Time/condition clause first:

If it rains, I will stay at home.
When she arrives, we will have dinner.
As soon as I land, I will send you a message.

Main clause first:

I will stay at home if it rains.
We will have dinner when she arrives.
I will send you a message as soon as I land.

Notice: when the main clause comes first, we do not use a comma.

Time/Condition Clause First (comma used)	Main Clause First (no comma)
If you are late, I will leave without you.	I will leave without you if you are late.
When he finishes, we will discuss the results.	We will discuss the results when he finishes.
Before I go, I will say goodbye.	I will say goodbye before I go.
Unless you hurry, we will be late.	We will be late unless you hurry.

Important Difference: "If" vs. "When"

Both if and when can be used in future clauses, but there is an important difference in meaning.

We use if when the situation is uncertain or possible – it might happen or it might not.

We use when when we are sure or very confident that it will happen – the only question is the timing.

Sentence	Meaning	Use
If I get the job, I will celebrate.	I might get the job – not certain.	Uncertain condition → use if
When I get home, I will cook dinner.	I am definitely going home – certain.	Expected/sure event → use when
If it snows, we will cancel the trip.	Snow is possible but not definite.	Uncertain condition → use if
When summer comes, we will visit the coast.	Summer will definitely come.	Expected/sure event → use when

Contractions in Future Clauses

In spoken English and informal writing, we often shorten will using contractions. Here are the common contractions with will:

Full Form	Contraction	Example
I will	I'll	I'll call you when I arrive.
you will	you'll	You'll feel better after you rest.
he will	he'll	He'll be happy if he passes.
she will	she'll	She'll text us when she leaves.
we will	we'll	We'll go out if the weather is nice.
they will	they'll	They'll celebrate when they win.
will not	won't	I won't leave until you come back.

Common Mistakes

Here are the most frequent mistakes learners make with future clauses. Study each one carefully.

❌ If it will rain, I will stay at home.
✅ If it rains, I will stay at home.
(Do not use "will" in the if/when clause.)

❌ When she will arrive, we will eat dinner.
✅ When she arrives, we will eat dinner.
(Use present simple after "when", not "will".)

❌ I will call you before I will leave.
✅ I will call you before I leave.
(Use present simple after "before", not "will".)

❌ As soon as he will finish, I'll go in.
✅ As soon as he finishes, I'll go in.
(Use present simple after "as soon as".)

❌ Unless she doesn't call me, I'll be worried.
✅ Unless she calls me, I'll be worried.
(Do not add "not" after "unless" – it already has a negative meaning.)

❌ When I am get home, I will cook.
✅ When I get home, I will cook.
(Use only one verb in the time clause.)

All Conjunctions at a Glance

Conjunction	Type	Example Sentence
if	condition (uncertain)	If you hurry, you will catch the train.
unless	negative condition	Unless you hurry, you will miss the train.
when	time (certain)	When I retire, I will travel a lot.
before	time (earlier event)	I will save my work before I close the laptop.
after	time (later event)	After she eats, she will do the washing up.
as soon as	time (immediately after)	I'll let you know as soon as I hear the news.
until	time (up to a point)	We will wait until the results come.

Future Clauses: Quick Summary

Let's review everything you have learned about future clauses:

• A future clause sentence has two parts: a time or condition clause and a main clause.
• The time or condition clause uses the present simple (NOT will).
• The main clause uses will + verb.
• Common conjunctions are: if, unless, when, before, after, as soon as, until.
• Use if for uncertain conditions, and when for things that are certain to happen.
• Unless means "if not" – do not add "not" in the unless clause.
• If the time/condition clause comes first, use a comma to separate the two parts.
• If the main clause comes first, no comma is needed.
• In spoken English, we often use contractions like I'll, she'll, won't.

Now practise future clauses in the exercises below.