It has already been shown before vs t had already been shown before

Both phrases are correct, but they are used in different contexts. "It has already been shown before" is the correct phrase to use in present perfect tense when referring to something that was demonstrated or proven in the past and still holds true. On the other hand, "It had already been shown before" is the correct phrase to use in past perfect tense when referring to something that had been demonstrated or proven before a specific point in the past.

Last updated: March 17, 2024 • 1067 views

This phrase is correct and commonly used in English.

"It has already been shown before"

This phrase is used in present perfect tense to indicate that something was demonstrated or proven in the past and still holds true.

Examples:

It has already been shown before that exercise is beneficial for health.
It has already been shown before that the theory is flawed.

Show examples from the web [+]

Sep 22, 2009 ... While still bringing out the "gold-standard" with the tracheal tube, it has already been shown before that the laryngeal mask airway (LMA) and ...
Mar 11, 2015 ... ... Gc is more immunogenic than Gn. It has already been shown before in immunization experiments, e.g. using the bunyavirus LaCrosse virus, ...
We are getting prepared for a spectacle as it has already been shown before by the renowned St. Moritz Match Race on that very same spot. The Esse 750 ...
ture. The difference in observations may be explained in part by the different oxygen atmospheres used. It has already been shown before that a 95 % oxygen ...

Alternatives:

It has been shown before
It was shown before
It has been demonstrated before
It has been proven before
It has been illustrated before

This phrase is correct and commonly used in English.

"t had already been shown before"

This phrase is used in past perfect tense to indicate that something had been demonstrated or proven before a specific point in the past.

Examples:

The results had already been shown before the meeting started.
The evidence had already been shown before the trial began.

Alternatives:

It had been shown before
It was shown before
It had been demonstrated before
It had been proven before
It had been illustrated before

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It has already been shown before vs t had already been shown before