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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
about that subject
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "about that subject" is correct and usable in written English.
It can be used when referring to a specific topic or matter that has been previously mentioned or is being discussed. Example: "I would like to share my thoughts about that subject during the meeting tomorrow."
✓ Grammatically correct
News & Media
Science
Wiki
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
What interested you about that subject?
News & Media
Even if they like to talk about that subject themselves.
News & Media
But I'll have more to add about that subject in a later post.
News & Media
Turning back to the news media, he said, "We don't care about that subject".
News & Media
"You can understand a little bit more what's happening about that subject laughing about it".
News & Media
I may have missed hearing about that subject, but I doubt it came up.
News & Media
"I don't want to even talk about that subject... Of course not.
News & Media
(She takes antidepressants, and Soda, on the album, is about that subject).
News & Media
What made you think a musical about that subject was a good idea?
News & Media
I wrote The Herd because I felt I had something to say about that subject matter.
News & Media
I think a large part of Obama's memoir, "Dreams from My Father," is precisely about that subject.
News & Media
Expert writing Tips
Best practice
Use "about that subject" when you want to directly refer back to a specific topic that has already been clearly established in the conversation or text.
Common error
Avoid using "about that subject" if the subject hasn't been clearly defined. This can lead to confusion. Always ensure the reference is unambiguous.
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "about that subject" functions as a prepositional phrase, modifying a verb or noun by specifying the topic or matter being referred to. Ludwig's examples confirm its role in connecting ideas to a previously mentioned subject.
Frequent in
News & Media
45%
Science
20%
Wiki
15%
Less common in
Formal & Business
10%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
In summary, "about that subject" is a grammatically sound and frequently used prepositional phrase that serves to reference a previously mentioned topic. According to Ludwig, it is deemed correct for use in written English, serving primarily to connect ideas or signal a return to a previous point in a conversation or text. Its neutral tone makes it adaptable to various contexts, particularly in News & Media and Scientific domains. When clarity and direct reference are needed, "about that subject" provides an effective means of linking ideas. For more formal situations, consider alternatives like "regarding that topic" or "pertaining to that matter".
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
regarding that topic
Changes the preposition for a more formal tone.
concerning that issue
Substitutes "subject" with "issue" for a slight shift in emphasis.
pertaining to that matter
Employs more formal vocabulary.
on that topic
Uses a simpler preposition.
with respect to that subject
Introduces a formal tone.
in relation to that theme
Replaces "subject" with "theme", adding a nuanced perspective.
in connection with that matter
Emphasizes a linked relationship.
relative to that point
Focuses on a specific point within the broader subject.
as regards that topic
Offers a slightly archaic alternative.
anent that issue
Uses a less common, more formal preposition to introduce the topic.
FAQs
How can I use "about that subject" in a sentence?
You can use "about that subject" to refer back to a topic previously discussed, for example, "I'd like to add something "concerning that issue" /s/about+that+subject." Ensure the subject is clear from the context.
What phrases are similar to "about that subject"?
Similar phrases include "regarding that topic", "concerning that issue", or "pertaining to that matter". The best choice depends on the desired level of formality and specific nuance.
Is it appropriate to use "about that subject" in formal writing?
While grammatically correct, "about that subject" is generally more appropriate for informal or neutral contexts. For formal writing, consider alternatives like "with respect to that subject" or "pertaining to that matter".
What's the difference between "about that subject" and "on that topic"?
"About that subject" and "on that topic" are often interchangeable. However, "about that subject" may imply a broader scope, while "on that topic" can suggest a more focused discussion.
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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
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested