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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
had been explored
Grammar usage guide and real-world examplesUSAGE SUMMARY
"had been explored" is a correct and usable phrase in written English.
It is commonly used in the past perfect passive tense to describe a past action or state that was finished before another past action or time. It can also be used to show that something was already known or understood at a certain point in the past. Example: The cave had been explored by many scientists before the new discoveries were made. In this sentence, "had been explored" suggests that the exploration of the cave was completed before the new discoveries were made. It also implies that the cave was already known and studied before the new discoveries were made.
✓ Grammatically correct
News & Media
Encyclopedias
Science
Alternative expressions(20)
had undergone investigation
had explored
was investigated
was examined
had been researched
had been scrutinized
had been surveyed
was looked into
had been considered
had been hospitalized
had been sidelined
had been rebuilt
had been destroyed
had been refused
had been taken
had been stabbed
had been hanged
had been decapitated
had been tortured
had been suffocated
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
57 human-written examples
It had been explored little until the 1990s, though early scientific explorations surrounding the sand sea had begun by the early 20th century.
Science
The Mount Katmai region had been explored in 1898.
Encyclopedias
He said "every avenue" had been explored in the hospital's attempt to save him.
News & Media
"I thought something new had been explored and presented," Poots said.
News & Media
Tonal harmony had been explored, expanded and chromatically thickened, many composers felt, to the point of inertia.
News & Media
One financial institution based in Bahrain, which was unwilling to be named, said it would not apply to the courts unless all other avenues had been explored.
News & Media
The WNEW decision was mutual and amicable, said Mr. Scelsa and a station spokesman, who both added that avenues had been explored to keep the show going.
News & Media
The anamorphic effect had been explored by 19th-century scientists and Renaissance painters, including Holbein, who famously used it to embed secret symbols in "The Ambassadors" (1533).
News & Media
But 74% said that nuclear power should not be considered as a solution for climate change before all other energy options had been explored.
News & Media
Mars had been explored, the eight months that remained before he could see his family stretched ahead, and the days were taken up by only relatively monotonous tasks.
News & Media
Within this context new developments took place in branches of mathematics that had been explored at least since The Nine Chapters, attesting to a continuity of mathematical practice.
Encyclopedias
Expert writing Tips
Best practice
Use "had been explored" to clearly indicate that an action of exploration was completed before a specific point in the past. This helps establish a clear chronological sequence in your writing.
Common error
Avoid using "had been explored" when a simpler past tense (e.g., "was explored") is sufficient. Overusing the past perfect can make your writing sound unnecessarily convoluted.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "had been explored" functions as the past perfect passive form of the verb "explore". It indicates that an action of exploring was completed at some point before another point in the past. As Ludwig AI explains, it showcases the completed state of exploration.
Frequent in
News & Media
34%
Science
27%
Encyclopedias
24%
Less common in
Wiki
10%
Formal & Business
3%
Reference
2%
Ludwig's WRAP-UP
In summary, the phrase "had been explored" is a versatile and grammatically sound construction used in the past perfect passive tense. Ludwig AI confirms its correctness and usability. It's commonly found in News & Media, Science, and Encyclopedias, indicating that an action of exploration was completed before a specific point in the past. When using this phrase, it's important to consider the tense and ensure it accurately reflects the chronological order of events. Alternatives include "was investigated" or "had undergone investigation", providing options for varying the expression. This phrase is a valuable tool for describing past events with precision and clarity.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
was investigated
Uses a simple past passive construction instead of the past perfect passive.
was examined
Replaces "explored" with a synonym, maintaining a similar meaning of scrutiny.
had undergone investigation
Substitutes "explored" with "undergone investigation" to emphasize a formal inquiry.
had been researched
Replaces "explored" with "researched", focusing on a systematic study.
was delved into
Employs a more figurative expression with "delved into", suggesting a thorough investigation.
had been scrutinized
Replaces "explored" with "scrutinized" to emphasize a close and critical examination.
had been surveyed
Suggests a broader overview rather than an in-depth investigation.
was looked into
Offers a more informal alternative, implying a preliminary inquiry.
had been checked out
Presents a casual alternative, suggesting a brief or cursory examination.
had been scouted
Suggests a reconnaissance or preliminary search, differing slightly from thorough exploration.
FAQs
How to use "had been explored" in a sentence?
Use "had been explored" to describe an action of exploration that was completed before another point in the past. For example, "The island "had been explored" by the time the settlers arrived".
What can I say instead of "had been explored"?
You can use alternatives like "was investigated", "was examined", or "had undergone investigation" depending on the specific context.
Which is correct, "had been explored" or "was explored"?
"Had been explored" indicates that the exploration happened and finished before another action in the past. "Was explored" simply indicates that the exploration happened at some point in the past without specifying its relation to another past event.
What's the difference between "had been explored" and "had explored"?
"Had been explored" is in the passive voice, indicating that something was explored by someone. "Had explored" is in the active voice, indicating that someone had done the exploring.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested