IF Clause or Conditional Sentence Type III

Conditional Tipe III 

this conditional sentence is more complex than the other. you should more careful with this type because there is some word that should know better.  this conditional type 3 is use to express a condition in the past that will not happen again or impossible happen. Usually this sentence use for regret or critic about something. This sentence use PAST PERFECT TENSE.

Form

(IF clause)	(main sentence)
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 sentence)	(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: Do not use would or wouldn’t in IF CLAUSE.

example:

• If I hadn't helped you, you would have failed. = You would have failed, if I hadn't helped you.
• If it had been sunny, we could have gone out. = We could have gone out, if it had been. 

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