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

It has already been shown before

This phrase is correct and commonly used in English.

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.

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

t had already been shown before

This phrase is correct and commonly used in English.

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