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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 investigating until
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "had been investigating until" is correct and usable in written English.
It can be used to indicate that an investigation was ongoing up to a certain point in time. Example: "The detectives had been investigating until they found the crucial piece of evidence that changed everything."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(1)
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
1 human-written examples
Former chancellors like Mr. Fernandez and Dr. Crew complained that they often did not know what Mr. Stancik had been investigating until after the information was released to the press.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
She heard nothing about the case from hospice officials and didn't learn it had been investigated until she was contacted by Kaiser Health News.
News & Media
Decade-old reviews of studies addressing urbanization and malaria by Keiser and others, 11 Tatem and Hay, 7 Hay and others, 3 and Utzinger and Keiser 6 summarized various research projects where this issue had been investigated until then.
Nanocluster generation during PLD has been investigated until recently [24].
Science
In this article, integration of a LiBr/water absorption chiller in a CHP site has been investigated until its cooling demand is satisfied.
This is in line with the claim, that every unisexual flower that has been investigated until now showed a certain degree of initial hermaphroditic characteristics [ 34].
Science
Meanwhile, Elections Canada had been investigating.
News & Media
has been investigating him since last year.
News & Media
The E.P.A. has been investigating the practice.
News & Media
"I've been investigating everything," she says.
News & Media
Genetic variation in PTPN22 has been investigated in autoimmune diseases, but until recently the role of PTPN22 modulation at the mRNA or protein level had not been considered.
Science
Expert writing Tips
Best practice
When using the phrase "had been investigating until", ensure the context clearly indicates the endpoint or condition that halted the investigation. This provides clarity and avoids ambiguity about the investigation's status.
Common error
Avoid using "had been investigating until" when the investigation is still ongoing. The 'until' implies a termination or change in the investigation's status, so ensure this aligns with the actual context.
Source & Trust
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "had been investigating until" functions as a verb phrase indicating a past continuous action that continued up to a specific point in time. As noted by Ludwig, it's a grammatically correct way to express this idea. The examples provided by Ludwig showcase its usage in various contexts, primarily in news and scientific articles.
Frequent in
Science
35%
News & Media
57%
Encyclopedias
8%
Less common in
Formal & Business
0%
Reference
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the phrase "had been investigating until" is a grammatically sound way to describe an investigation that was ongoing and then stopped at a certain point. Ludwig's examples and the grammatical analysis confirm its correct usage, primarily in neutral to formal contexts like news and scientific articles. While not extremely common, the phrase serves to provide a clear timeline, indicating the duration and endpoint of the investigative activity. When using this phrase, make sure the context clearly defines what marked the end of the investigation. As noted by Ludwig, alternatives like "had been probing until" or "had been examining until" can offer subtle variations in meaning.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
had been probing until
Replaces "investigating" with "probing", suggesting a more in-depth exploration.
had been examining until
Substitutes "investigating" with "examining", implying a closer, more detailed look.
had been scrutinizing until
Replaces "investigating" with "scrutinizing", indicating a critical and thorough inspection.
had been researching up to
Changes "investigating until" to "researching up to", focusing on the research aspect of the inquiry.
had been inquiring into until
Uses "inquiring into" instead of "investigating", suggesting a formal questioning or inquiry.
had been delving into until
Replaces "investigating" with "delving into", implying a deep and thorough exploration.
had been exploring until
Substitutes "investigating" with "exploring", focusing on the discovery aspect of the process.
was under investigation until
Changes the active voice to passive, focusing on the subject of the investigation.
the inquiry continued until
Rephrases to emphasize the continuation of the inquiry rather than the act of investigating.
the matter was investigated until
Focuses on the matter being the subject and emphasizes completion until a specific point.
FAQs
How can I use "had been investigating until" in a sentence?
Use "had been investigating until" to indicate that an investigation was underway and continued up to a specific point in time. For example, "The detectives "had been investigating until" they found the crucial piece of evidence".
What are some alternatives to "had been investigating until"?
You can use alternatives such as "had been probing until", "had been examining until", or "was under investigation until" depending on the nuance you wish to convey.
Is it correct to say "had been investigating until"?
Yes, "had been investigating until" is grammatically correct. It uses the past perfect continuous tense to show an action that was in progress before another point in the past.
What's the difference between "had been investigating until" and "had investigated until"?
"Had been investigating until" implies a continuous action up to a certain point. "Had investigated until" (though less common) would suggest that the investigation was completed multiple times up to that point, but is grammatically less conventional. The continuous form is generally preferred when describing an ongoing inquiry.
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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
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested