Forming the 'perfect' tenses with the auxiliary 'have'

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Forming the 'perfect' tenses with the auxiliary 'have'

Followed by a past participle, the auxiliary have is used to form the 'perfect' tenses:
Present Perfect -> He has understood.
Past Perfect -> She had done a great job.
Future Perfect -> They will have finished by tomorrow.
Conditional Perfect -> We would (or We'd) have won the game if we had had a great player like him.
Auxiliary + have + past participle -> She must have called.


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