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There are 3 types of Conditional Sentences :-

1. Future Possible    

       - If + Sub + Present Simple, Sub + will + V1.

    If he studies hard, he will pass the exam.

    If I study hard, I will pass the exam.

2. Present Unreal     

       - If + Past Simple. Sub + would + V1.

    If he studied hard, he would pass the exam.

    If I studied hard, I would pass the exam.

3. Past Unreal  

       - If + Sub + Past Perfect, Sub + would have + V3. 

    If he had studied hard, he would have passed the exam.

    If I had studied hard, I  would have passed the exam.

Try to study the form of Conditional Sentences  from the table below and do the exercises.