- ZERO: If + present.../present
If you like music, you should go to a concert.
- FIRST: If + present/future
If it rains, I won´t go to the park.
- SECOND: If + past simple/would +infinitive
If I studied, I would pass the exams.
- THIRD: If + past perfect/would have + past participle
If you had studied, you would have passed the exam.
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