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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
have not found
Grammar usage guide and real-world examplesUSAGE SUMMARY
"have not found" is correct and usable in written English.
You can use it to talk about something you have been searching for and haven't been able to locate. Example: I have been looking for my car keys for hours, but I have not found them yet.
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
59 human-written examples
We still have not found my brother.
News & Media
I have not found a balance yet".
News & Media
They have not found hot springs.
News & Media
I have not found it to be a comfortable experience.
News & Media
I have not found any difficulties being a woman.
News & Media
We have not found a conflict of interest".
News & Media
I have not found it like that at all.
News & Media
American military forces have not found any buried mobile labs.
News & Media
"But we have not found our ultimate speed.
News & Media
"They have not found lakes or rivers flowing on Mars.
News & Media
But we just have not found that yet".
News & Media
Expert writing Tips
Best practice
When using "have not found", ensure the tense is consistent with the rest of the sentence. For example, "Although I have searched extensively, I have not found any evidence."
Common error
Avoid switching tenses mid-sentence when using "have not found". For example, instead of saying "I have not found it yet, but I will keep looking", say "I have not found it yet, but I will keep looking."
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "have not found" functions as a verb phrase within a sentence. It typically indicates a lack of discovery or location after a period of searching or investigation. Ludwig AI confirms its proper usage in diverse contexts.
Frequent in
News & Media
37%
Science
55%
Encyclopedias
3%
Less common in
Formal & Business
2%
Reference
1%
Social Media
0%
Ludwig's WRAP-UP
"Have not found" is a grammatically sound phrase used to express the absence of something after a search or investigation. Ludwig AI affirms its correctness, with examples from various authoritative sources such as The New York Times, The Guardian, and scientific journals. Its neutral register makes it suitable for diverse contexts, with the most frequent occurrences in scientific and news-related content. While alternatives like "haven't located" or "have been unable to find" exist, "have not found" remains a common and versatile choice for conveying a lack of discovery or location.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
haven't located
A more concise contraction is used, suitable for informal contexts.
have been unable to find
Emphasizes the inability and effort exerted in the search.
have not discovered
Focuses on the lack of discovery rather than just location.
have failed to find
Highlights the unsuccessful outcome of the search.
have not detected
Implies a search using specific tools or methods to detect something.
have not identified
Focuses on the lack of identification, potentially of something already located.
have yet to find
Indicates that the search is ongoing, with an expectation of finding something in the future.
remain unable to locate
Suggests a persistent inability to find something over a period.
the search has been fruitless
Describes the outcome of the search as unproductive.
have come up empty
An idiomatic expression indicating an unsuccessful search.
FAQs
How can I use "have not found" in a sentence?
You can use "have not found" to indicate that you have been searching for something but have not yet located it. For example, "I have been looking for my keys all day, but I "have not found" them yet."
What are some alternatives to "have not found"?
Some alternatives to "have not found" include "haven't located", "have been unable to find", and "have not discovered". The best choice depends on the specific context.
Is it correct to say "haven't found" instead of "have not found"?
Yes, "haven't found" is a common contraction of "have not found" and is perfectly acceptable in most contexts, especially informal ones. Both phrases are grammatically correct.
What is the difference between "have not found" and "did not find"?
"Have not found" implies a search process that is still ongoing or has recently concluded without success. "Did not find" suggests a completed action in the past with a negative result.
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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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested