1. Use
It is impossible
to fulfil a condition which is given in the if-clause.
2. Form
if clause
|
main clause
|
Past Perfect
|
would + have + past participle
|
could + have + past participle
|
|
might + have + past participle
|
3. Examples
if clause
|
main clause
|
If I had studied,
|
I would have passed
the exams.
|
If I had studied,
|
I could have passed
the exams.
|
If I had studied,
|
I might have passed
the exams.
|
The
if-clause can be at the beginning or at the end of a sentence.
if clause
|
main clause
|
If I had studied,
|
I would have passed
the exams.
|
main clause
|
if clause
|
I would have passed
the exams
|
if I had studied.
|
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