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
main subject for
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "main subject for" is correct and usable in written English.
It can be used when discussing the primary topic or focus of a discussion, paper, or study. Example: "The main subject for our research is the impact of climate change on biodiversity."
✓ Grammatically correct
News & Media
Science
Wiki
Alternative expressions(4)
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
8 human-written examples
Mr. Kadyrov and his security services had been Ms. Estemirova's main subject for years.
News & Media
"My chosen main subject for my masters was demon parent figures in gothic literature in the 18th century.
News & Media
This was during a period when Japan was so expensive for people with dollars that one result of the trip was a column about how the main subject for discussion among Americans in Tokyo was how much a melon cost.
News & Media
In vocational school, the main subject for developing 'commercial competence' is 'Economics and Society' (E&S).
That's the main subject for us".
Wiki
Which brings us right back to our main subject for this week.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
52 human-written examples
Investigation of this behaviour will remain one of the main subjects for fire engineering research in the coming years.
Its syllabus covers the main subjects for production management and control (forecasting, problem solving, aggregate planning, inventory control, master plan, MRP, push and pull systems, ERP/CRM) and it is the single course in the domain in the MsC degree.
Science
Using the expression of miRNAs to obtain a differential diagnosis in cardiovascular pathologies is the main subject of study for many research groups [ 34].
The president's aristocratic wife, Bernadette, who was the main subject of the interview for French television, left no doubt she was resigned to a different life.
News & Media
For the main subject of our study, question 30 of EORTC QLQ-30 (Q30 = Quality of Life), no difference was apparent between groups 1 and 2 (significance level P = 0.119 > 0.005), ie, there is no difference in QOL related to the treatment type followed.
Expert writing Tips
Best practice
When using "main subject for", ensure it clearly identifies the core topic or theme you're addressing. Clarity in specifying the "main subject" enhances the focus and direction of your writing.
Common error
Avoid using "main subject for" when referring to supporting details or tangential topics. Ensure the subject you're highlighting is indeed the central focus, not just a related aspect.
Source & Trust
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "main subject for" functions as a noun phrase modifier, introducing or specifying the primary focus of a discussion, study, or creative work. This usage is validated by the examples provided by Ludwig.
Frequent in
News & Media
43%
Science
34%
Wiki
13%
Less common in
Encyclopedias
5%
Formal & Business
5%
Reference
0%
Ludwig's WRAP-UP
In summary, "main subject for" is a grammatically correct and usable phrase in English, though considered uncommon in frequency. It is used to clearly identify the primary topic or focus in a discussion, study, or creative work. Ludwig AI confirms its validity and provides examples across diverse sources such as news media, scientific publications, and encyclopedias. While it is suitable for professional and neutral registers, ensure the "main subject" truly represents the central theme to avoid misdirection. Alternatives include "principal topic of" and "central theme of". Overall, the phrase is a reliable means of specifying the core focus of your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
principal topic of
Focuses on the topic's importance.
central theme of
Emphasizes the recurring idea.
primary focus of
Highlights the point of attention.
chief concern of
Indicates a significant worry.
key area of
Denotes a specific field of importance.
major theme in
Points out a dominant idea.
dominant subject of
Highlights the prevailing topic.
core issue for
Pinpoints a fundamental problem.
essential point of
Stresses a crucial element.
overriding concern in
Underscores the most important worry.
FAQs
How can I use "main subject for" in a sentence?
Use "main subject for" to introduce the core topic or area of focus, for example, "The "main subject for" today's discussion is climate change".
What are some alternatives to "main subject for"?
You can use alternatives like "principal topic of", "central theme of", or "primary focus of" to convey a similar meaning.
Is it appropriate to use "main subject for" in formal writing?
Yes, "main subject for" is suitable for formal writing as it clearly and directly identifies the primary topic. More formal alternatives could be used depending on style such as "principal topic of".
What's the difference between "main subject for" and "topic about"?
"Main subject for" indicates the core topic or area of concentration, whereas "topic about" is more general. The former is more specific in highlighting the central theme, while the latter could encompass a broader range of related subjects.
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
82%
Authority and reliability
4.1/5
Expert rating
Real-world application tested