Conditional Sentences (Conditional Clauses, If Clauses) are used to express that the action in the main clause can only take place if a certain condition is fulfilled.

 

 

The zero conditional describes situations that are always true. Example: If I go to school, I get up at seven. 


Examples:

If-clause at the beginning:
If I study, I will pass the exam.

If-clause at the end:
I will pass the exam if I study.

Negative sentences:
If I study, I will not fail the exam.


More examples:

  • If we had money, we’d buy a bigger house.
  • If I were you, I wouldn’t do it.
  • If it rains, I’ll stay at home.
  • If you promise to do it, I’ll help you.
  • If she calls me, tell her to leave a message.
  • If John were here, he’d know to do.

 

commented

I think it´s important to point out that the 3th conditional refers to the past whilst the 1st and 2nd deal with future.
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