Often called the "unreal" conditional because it is used for unreal - impossible or improbable - situations. This conditionalprovides an imaginary result for a given situation.
The verb 'to be', when used in the 2nd conditional, is always conjugated as'were'.
If he studied more, he would pass the exam.
I would lower taxes if I were the President.
They would buy a new house if they had moremoney.
Conditional 2 is formed by the use of the past simple in the if clause followed by a comma would verb (base form) in the result clause. Youcan also put the result clause first without using a comma between the clauses.
If they had more money, they would buy a new house.
ORThey would buy a new house if they had more money.
Often referred to as the "past" conditional because it concerns only pastsituations with hypothetical results. Used to express a hypothetical result to a past given situation.
If he had known that, he would havedecided differently.
Jane would have found a new job if she had stayed in Boston.
Conditional 3 is formed by the use of the past perfect in the ifclause followed by a comma would have past participle in the result clause. You can also put the result clause first without using a commabetween the clauses.
If Alice had won the competition, life would have changed OR Life would have changed if Alice had won the competition.