English Conditionals

English Conditionals

There are several structures in English that are called conditionals.

"Condition" means "situation or circumstance". If a particular condition is true, then a particular result happens.

• If y = 10 then 2y = 20
• If y = 3 then 2y = 6

There are three basic conditionals that we use very often. There are some more conditionals that we do not use so often.

In this lesson, we will look at the three basic conditionals as well as the so-called zero conditional. We'll finish with a quiz to check your understanding.

People sometimes call conditionals "IF" structures or sentences, because there is usually (but not always) the word "if" in a conditional sentence.

• Structure of Conditional Sentences 
• First Conditional
• Second Conditional
• Third Conditional
• Zero Conditional
• Summary
• Quiz

Structure of Conditional Sentences

The structure of most conditionals is very simple. There are two basic possibilities. Of course, we add many words and can use various tenses, but the basic structure is usually like this:

IF	condition	result
IF	y = 10	2y = 20

or like this:

result	IF	condition
2y = 20	IF	y = 10

First Conditional: real possibility

We are talking about the future. We are thinking about a particular condition or situation in the future, and the result of this condition. There is a real possibility that this condition will happen. For example, it is morning. You are at home. You plan to play tennis this afternoon. But there are some clouds in the sky. Imagine that it rains. What will you do?

IF	condition	result
	present simple	WILL + base verb
If	it rains	I will stay at home.

Notice that we are thinking about a future condition. It is not raining yet. But the sky is cloudy and you think that it could rain. We use the present simple tense to talk about the possible future condition. We use WILL + base verb to talk about the possible future result. The important thing about the first conditional is that there is a real possibility that the condition will happen. Here are some more examples (do you remember the two basic structures: [IF condition result] and [result IF condition]?):

IF	condition	result
	present simple	WILL + base verb
If	I see Mary	I will tell her.
If	Tara is free tomorrow	he will invite her.
If	they do not pass their exam	their teacher will be sad.
If	it rains tomorrow	will you stay at home?
If	it rains tomorrow	what will you do?

result	IF	condition
WILL + base verb		present simple
I will tell Mary	if	I see her.
He will invite Tara	if	she is free tomorrow.
Their teacher will be sad	if	they do not pass their exam.
Will you stay at home	if	it rains tomorrow?
What will you do	if	it rains tomorrow?

Sometimes, we use shall, can, or may instead of will, for example: If you are good today, you can watch TV tonight.

Second Conditional: unreal possibility or dream

The second conditional is like the first conditional. We are still thinking about the future. We are thinking about a particular condition in the future, and the result of this condition. But there is not a real possibility that this condition will happen. For example, you do not have a lottery ticket. Is it possible to win? No! No lottery ticket, no win! But maybe you will buy a lottery ticket in the future. So you can think about winning in the future, like a dream. It's not very real, but it's still possible.

IF	condition	result
	past simple	WOULD + base verb
If	I won the lottery	I would buy a car.

Notice that we are thinking about a future condition. We use the past simple tense to talk about the future condition. We use WOULD + base verb to talk about the future result. The important thing about the second conditional is that there is an unreal possibility that the condition will happen.

Here are some more examples:

IF	condition	result
	past simple	WOULD + base verb
If	I married Mary	I would be happy.
If	Ram became rich	she would marry him.
If	it snowed next July	would you be surprised?
If	it snowed next July	what would you do?

result	IF	condition
WOULD + base verb		past simple
I would be happy	if	I married Mary.
She would marry Ram	if	he became rich.
Would you be surprised	if	it snowed next July?
What would you do	if	it snowed next July?

Sometimes, we use should, could or might instead of would, for example: If I won a million dollars, I could stop working.

 Third Conditional: no possibility

The first conditional and second conditionals talk about the future. With the third conditional we talk about the past. We talk about a condition in the past that did not happen. That is why there is no possibility for this condition. The third conditional is also like a dream, but with no possibility of the dream coming true.

Last week you bought a lottery ticket. But you did not win. :

	condition	result
	Past Perfect	WOULD HAVE + Past Participle
If	I had won the lottery	I would have bought a car.

Notice that we are thinking about an impossible past condition. You did not win the lottery. So the condition was not true, and that particular condition can never be true because it is finished. We use the past perfect tense to talk about the impossible past condition. We use WOULD HAVE + past participle to talk about the impossible past result. The important thing about the third conditional is that both the condition and result areimpossible now.

Sometimes, we use should have, could have, might have instead ofwould have, for example: If you had bought a lottery ticket, you might have won.

Look at some more examples in the tables below:

IF	condition	result
	past perfect	WOULD HAVE + past participle
If	I had seen Mary	I would have told her.
If	Tara had been free yesterday	I would have invited her.
If	they had not passed their exam	their teacher would have been sad.
If	it had rained yesterday	would you have stayed at home?
If	it had rained yesterday	what would you have done?

result	IF	condition
WOULD HAVE + past participle		past perfect
I would have told Mary	if	I had seen her.
I would have invited Tara	if	she had been free yesterday.
Their teacher would have been sad	if	they had not passed their exam.
Would you have stayed at home	if	it had rained yesterday?
What would you have done	if	it had rained yesterday?

 Zero Conditional: certainty

We use the so-called zero conditional when the result of the condition is always true, like a scientific fact.
Take some ice. Put it in a saucepan. Heat the saucepan. What happens? The ice melts (it becomes water). You would be surprised if it did not.

IF	condition	result
	present simple	present simple
If	you heat ice	it melts.

Notice that we are thinking about a result that is always true for this condition. The result of the condition is an absolute certainty. We are not thinking about the future or the past, or even the present. We are thinking about a simple fact. We use the present simple tense to talk about the condition. We also use the present simple tense to talk about the result. The important thing about the zero conditional is that the condition always has the same result.

We can also use when instead of if, for example: When I get up late I miss my bus.

Look at some more examples in the tables below:

IF	condition	result
	present simple	present simple
If	I miss the 8 o'clock bus	I am late for work.
If	I am late for work	my boss gets angry.
If	people don't eat	they get hungry.
If	you heat ice	does it melt?

result	IF	condition
present simple		present simple
I am late for work	if	I miss the 8 o'clock bus.
My boss gets angry	if	I am late for work.
People get hungry	if	they don't eat.
Does ice melt	if	you heat it?

Conditionals: Summary

Here is a chart to help you to visualize the basic English conditionals. Do not take the 50% and 10% figures too literally. They are just to help you.

probability		conditional	example	time
100%		zero conditional	If you heat ice, it melts.	any time
50%		first conditional	If it rains, I will stay at home.	future
10%		second conditional	If I won the lottery, I would buy a car.	future
0%		third conditional	If I had won the lottery, I would have bought a car.	past

Conditionals Quiz

1	What would you do if it     on your wedding day?
2	If she comes I     call you.
3	If I eat peanut butter I     sick.
4	What will you do if you     the history exam?
5	If they had not     the car I would have driven you.
6	If it snows     still drive to the coast?
7	He would have     with you if you had asked him.
8	If I won a million dollars I     my own airplane.
9	If I forget her birthday Andrea     upset.
10	Jacob will pick you up at school if it    .