English Grammar Conditional 3 / 3rd Conditional / Conditional III

Used to express conditions in the past that did not happen. Often used to express criticism or regret with would have, could have or should have.

Uses the past perfect tense:-

Formation

(IF Clause)	(Main Clause)
If I had worked harder,	I would have passed my exam.
If I had worked harder,	I could have passed my exam.
If I had worked harder,	I should have passed my exam.

or...

(Main Clause)	(IF Clause)
I would have passed my exam	if I had worked harder.
I could have passed my exam	if I had worked harder.
I should have passed my exam	if I had worked harder.

Note! We never use would have, or wouldn't have etc in the if clause.

For example:

• If I hadn't helped you, you would have failed. = You would have failed, if I hadn't helped you. (I helped you so you didn't fail).
• If it had been sunny, we could have gone out. = We could have gone out, if it had been. (We didn't go out because it wasn't sunny).

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