Used and loved by millions
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 underwent
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "had underwent" is not correct in English.
The correct form is "had undergone." You can use "had undergone" to describe an action that was completed in the past before another past action. Example: "She had undergone surgery before she started her recovery process."
⚠ May contain grammatical issues
Science
News & Media
Academia
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
7 human-written examples
In the group of children, 9 children had underwent laparotomies, 2 had underwent two laparotomies and 3 had underwent three laparotomies.
Science
At the age of 10 months old while his weight was 4.8 kg, the infant had underwent a laparoscopic surgery for repair of the gastrointestinal anomalies; the baby was transferred to the operating room with a 3.5-mm endotracheal tube (ETT) inserted into the trachea.
Science
Out of 120 patients, USG was positive in 114 patients, and foreign body was retrieved from 108 patients, and in six patients for whom USG was falsely positive, five had underwent at least one previous surgical exploration, whereas among the six patients in whom USG was negative, foreign body was retrieved in one patient who had chronic discharge near ankle region.
One hundred and twenty patients underwent surgical exploration; among them 114 patients had a positive USG, and foreign body was retrieved from 108 patients, and in the rest of six patients in whom USG was positive, five had underwent at least one previous exploration.
The number of synonymous substitutions/site/year revealed that class REM IX genes had underwent a duplication event about 4 to 14 million years ago, corroborating the hypotheses mentioned before that specific class of REM genes result from recent duplication events (Table S6).
Science
Furthermore, postoperative severe airway complications were not observed in the patients who had underwent the blind repositioning of DLTs.> -wrap-foot> Vareexpressedpressed as number of patients.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
53 human-written examples
Recently it had undergone some financial strain.
News & Media
Since then, Osama had undergone a transformation.
News & Media
The couple had undergone genetic testing beforehand.
News & Media
Clearly Tralin had undergone a transformation.
Coincidentally, Ms. Bonaro had undergone one, too.
News & Media
Expert writing Tips
Best practice
Always use "had undergone" instead of "had underwent". This is the grammatically correct past perfect form of the verb 'undergo'.
Common error
Avoid using "had underwent" because it incorrectly mixes the auxiliary verb 'had' with the base form of 'undergo'. Remember to use the past participle 'undergone' with 'had' to form the past perfect tense.
Source & Trust
85%
Authority and reliability
2.2/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "had underwent" is an incorrect form of the past perfect tense. The correct form uses the past participle 'undergone'. The incorrect usage is highlighted by Ludwig, which identifies it as grammatically flawed.
Frequent in
Science
43%
News & Media
29%
Academia
28%
Less common in
Encyclopedias
0%
Wiki
0%
Formal & Business
0%
Ludwig's WRAP-UP
In summary, the phrase "had underwent" is a grammatically incorrect construction. The correct past perfect form is "had undergone". While Ludwig's analysis of various sources reveals that "had underwent" appears in some contexts (including scientific and news media), it is not considered standard English. As Ludwig AI points out, the use of the base form 'underwent' with 'had' is a grammatical error. To ensure clarity and accuracy in writing, always opt for "had undergone" or other suitable alternatives like "had experienced" or "had gone through".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
had experienced
Uses a different verb to express a similar action.
had gone through
Employs a phrasal verb indicating a process or event.
had been subjected to
Indicates that someone or something was made to undergo something.
had participated in
Suggests involvement in an activity or event.
had taken part in
Synonymous with 'had participated in'.
had been exposed to
Indicates being subjected to an influence or experience.
had been a part of
Indicates being involved or included in something.
had seen
Emphasizes witnessing or observing an event.
had familiarity with
Suggests being acquainted or knowledgeable about something.
had knowledge of
Highlights awareness or understanding of something.
FAQs
What is the correct form, "had underwent" or "had undergone"?
The correct form is "had undergone". "Had underwent" is grammatically incorrect.
How can I use "had undergone" in a sentence?
"Had undergone" is used to describe an action completed before another action in the past. Example: 'She had undergone surgery before she started her recovery process.'
What are some alternatives to "had undergone"?
Depending on the context, you can use alternatives like "had experienced", "had gone through", or "had been subjected to".
Is "had underwent" ever acceptable in writing?
No, "had underwent" is not considered acceptable in standard English writing. Always use "had undergone" instead.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
85%
Authority and reliability
2.2/5
Expert rating
Real-world application tested