It is used in the 3rd Conditional to talk about imaginary situations in the past: eg: If she'd seen the advert, she would have applied for the job.
NOTE: 'If she'd seen = If she had seen
'WOULD HAVE' + Past Participle
See Also: Conditionals; 1st Conditional; 2nd Conditional; Modal Verb; Auxiliary Verb Related Article English Conditionals - Read up on the English Conditionals and discover how they are used to talk about possible or imaginary situations
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