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
they understood of
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "they understood of" is not correct in standard written English.
It is typically used incorrectly when trying to convey comprehension or knowledge about something. Example: "They understood of the challenges we faced" should be "They understood the challenges we faced."
⚠ May contain grammatical issues
News & Media
Science
Alternative expressions(2)
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
3 human-written examples
"They understood, of course, our desire to move quickly".
News & Media
In their first encounters, it had been unclear how much they understood of the outside world.
News & Media
Current understanding of glaucoma was assessed by asking patients what they understood of glaucoma.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
53 human-written examples
How much – if anything – do you think they understand of what they are saying?
News & Media
What interests the Coens is how foolishly people behave, and how little they understand of what they're doing.
News & Media
Many students do not realize how much (or how little) they understand of material until they attempt to solve problems.
Science
They understood nothing of …..Political Economy and Christianity.
Science
They understood the importance of nonconforming together.
News & Media
They understood the value of cloth".
News & Media
They understood the energy of London, they understood its variety, and they also understood its darkness".
News & Media
They understood the value of making Congress their ally".
News & Media
Expert writing Tips
Best practice
Always use the correct preposition with "understood". Use "understood" followed directly by the object of understanding, or use "understood about" or "understood by". For example: "They understood the problem", "The rule was understood by everyone".
Common error
Avoid using "of" directly after "understood" when you mean "understood something". The correct form is usually "They understood [something]" not "They understood of [something]".
Source & Trust
87%
Authority and reliability
1.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "they understood of" is generally considered grammatically incorrect. The verb "understood" typically takes a direct object. Ludwig AI highlights that the correct usage involves omitting "of" or using alternative prepositions like "about" or "by" in specific constructions.
Frequent in
News & Media
67%
Science
33%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "they understood of" is generally considered grammatically incorrect in standard written English. As Ludwig AI points out, the correct form is usually "they understood [something]", or using alternative prepositions like "about" or "by" in certain constructions. Although examples can be found in various sources, including reputable news outlets, these instances represent incorrect usage. Therefore, it's best to avoid this phrase and opt for grammatically sound alternatives such as "they understood", "they were aware of", or "they comprehended" to ensure clarity and accuracy in your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
they understood
Omits "of", correcting the grammatical structure while retaining a general sense of comprehension.
they were aware of
Replaces "understood" with "were aware", focusing on recognition and knowledge.
they comprehended
Substitutes "understood" with "comprehended", implying a deeper level of understanding.
they grasped
Uses "grasped" to indicate a clear and complete understanding.
they realized
Emphasizes the moment of understanding or becoming aware.
they recognized
Highlights the ability to identify and understand something.
they perceived
Implies an understanding based on observation or intuition.
they appreciated
Focuses on understanding the value or importance of something.
they were cognizant of
Formally expresses awareness and understanding.
they had knowledge of
States a factual understanding or information about something.
FAQs
How to correctly use "understood" in a sentence?
Use "understood" followed by the object of understanding (e.g., "They understood the assignment") or use "understood about" or "understood by", depending on the context. Avoid using "of" directly after "understood".
What is a grammatically correct alternative to "they understood of"?
Instead of "they understood of", you can use alternatives like "they understood", "they were aware of", or "they comprehended".
Is it ever correct to use "of" after "understood"?
While "understood of" is generally incorrect, the preposition "of" can follow the verb "understand" in other constructions. For example, "understood of all" to mean it is something everyone knows.
What's the difference between "they understood of" and "they understood"?
"They understood of" is generally considered grammatically incorrect. The correct phrase is "they understood", which means they had a grasp or comprehension of something.
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
87%
Authority and reliability
1.8/5
Expert rating
Real-world application tested