We use the
zero conditional to talk about causes and results that are always true:
I can't study if it's noisy.We use the first conditional to talk about possible events and their results:
If I get a job, I'll move into my own apartment.
We use the second conditional to talk about situations that are not real or unlikely (when we imagine events and their results):
If I did a bungee jump, I'd be very nervous!
We use the third conditional to talk about imaginary situations in the past and their imaginary results (often to express regret or criticism):
If I'd driven more slowly, I wouldn't have had an accident.