Look at these examples to see how zero, first and second conditionals are used.
If you freeze water, it becomes solid.
If it rains tomorrow, I'll take the car.
If I lived closer to the cinema, I would go more often.
Try this exercise to test your grammar.
- Grammar test 1
Read the explanation to learn more.
Grammar explanation
Conditionals describe the result of a certain condition. The if clause tells you the condition (If you study hard) and the main clause tells you the result (you will pass your exams). The order of the clauses does not change the meaning.
If you study hard, you will pass your exams.
You will pass your exams if you study hard.
Conditional sentences are often divided into different types.
Zero conditional
We use the zero conditional to talk about things that are generally true, especially for laws and rules.
If I drink too much coffee, I can't sleep at night.
Ice melts if you heat it.
When the sun goes down, it gets dark.
The structure is: if/when + present simple >> present simple.
First conditional
We use the first conditional when we talk about future situations we believe are real or possible.
If it doesn't rain tomorrow, we'll go to the beach.
Arsenal will be top of the league if they win.
When I finish work, I'll call you.
In first conditional sentences, the structure is usually: if/when + present simple >> will + infinitive.
It is also common to use this structure with unless, as long as, as soon as or in case instead of if.
I'll leave as soon as the babysitter arrives.
I don't want to stay in London unless I get a well-paid job.
I'll give you a key in case I'm not at home.
You can go to the party, as long as you're back by midnight.
Second conditional
The second conditional is used to imagine present or future situations that are impossible or unlikely in reality.
If we had a garden, we could have a cat.
If I won a lot of money, I'd buy a big house in the country.
I wouldn't worry if I were you.
The structure is usually: if + past simple >> + would + infinitive.
When if is followed by the verb be, it is grammatically correct to say if I were, if he were, if she were and if it were. However, it is also common to hear these structures with was, especially in the he/she form.
If I were you, I wouldn't mention it.
If she was prime minister, she would invest more money in schools.
He would travel more if he was younger.
Do this exercise to test your grammar again.
- Grammar test 2
Hello Via,
I'm afraid this is a very general question. The comments sections of the site are for short answers rather than long explanations. We're happy to explain any examples on our pages which you find confusing or unclear, and we'll try to help if you need help expressing something.
Longer explanations are published on our pages and if you search for a given topic in the grammar reference section then you'll often find the information you need. We have a page on will vs would, for example:
https://learnenglish.britishcouncil.org/english-grammar-reference/will-and-would
We also have a page on verb forms in time clauses and if clauses:
https://learnenglish.britishcouncil.org/english-grammar-reference/verbs-in-time-clauses-and-if-clauses
Peter
The LearnEnglish Team
Hello Ali_Gokapl98,
As far as I know, 'must' can be used in a first conditional sentence. For example, one could say 'If you must know, I'll tell you'. It might be a bit unusual, though.
All the best,
Kirk
The LearnEnglish Team
Hello Ali_Gokalp98,
Your example is fine.
It's perfectly fine to use a range of modal verbs in the result clause of a conditional sentence. Sometimes this is will or would, but other modals can also be used:
Peter
The LearnEnglish Team
Hello Ali_Gokalp98,
When we use 'be' in such a situation, 'were' is correct for all subjects and 'was' is correct for 'I', 'he', 'she' and 'it'. I'm not aware of any difference for 'there is/are'. In other words, as far as I know, both of the sentences you ask about are correct. Some people say that 'were' is better here, so if you're writing this, that might be a better choice.
Hope this helps.
All the best,
Kirk
The LearnEnglish Team