Conditionals

Zero conditional:

·It is used to universal truths. Present
·Form: If+present simple+,+present simple
·Ex: If you freeze water, it turns into ice.

First conditional:

·It is used to open condition, what it is said in the condition is possible. Present and future
·Form: If+ present simple+ will+infinitive
·Ex: If it rains today, I'll stay at home.


Second conditional:

·It is used to unreal or improbable situations. A real situation that you would like to change in the future. Present or future.
·Form: If+past simple+would+infinitive
·Ex: If I studied, I would pass the exams.


Third conditional:

·It is used when we are talking about a situation that wasn't in the past-Unreal past conditions. Past.
·Form: If+past perfect+would have+past participle
·Ex: If I had studied, I would have passed the exams.

Other things about conditionals: 
- For the second conditional, were replaces was: If I were a rich person...
- Instead of if not, we can use unless.
- Instead of if, we can use as long as, provided (that) or supposing that.
- The if-clause can go at the beginning or the end of a sentence.
-We often write a comma after the if-clause.

·Exercises that can help you to learn the conditionals sentences:
Conditional's exercises.