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
on
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "on" is correct and usable in written English, depending on the context in which it is used.
You can use it to indicate a position, a state, or a condition related to something. Example: "The book is on the table."
✓ Grammatically correct
News & Media
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
58 human-written examples
They got on well.
News & Media
What was going on?
News & Media
What is going on?
News & Media
It was difficult to continue with competing but I tried to carry on".
News & Media
North Korea's recent test-firing of a ballistic missile from a submarine was "very serious and concerning", South Korea said on Monday, with one defence official suggesting Pyongyang could have a fully operational platform in two or three years.
News & Media
"I've read a series of glowing references on behalf of every one of you.
News & Media
What is going on here?
News & Media
On the contrary.
News & Media
Shame on me.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
2 human-written examples
David, if you think this election is about leadership, then debate me one on one.
News & Media
Properly implemented strong crypto systems are one of the few things that you can rely on.
News & Media
Expert writing Tips
Best practice
When using "on" to indicate a date, remember to specify the day of the week. For example, "I'll see you on Monday."
Common error
Avoid using "on" when "onto" is more appropriate. "Onto" implies movement to a surface, while "on" indicates a static position. For example, use "He jumped onto the table" instead of "He jumped on the table" if you want to show the movement.
Source & Trust
93%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The word "on" serves multiple grammatical functions, acting as a preposition, adverb, verb, or adjective. Its primary function is to indicate location, time, or a state of being, as demonstrated by Ludwig's examples. The versatility of "on" allows it to connect ideas and provide essential contextual information in various sentences.
Frequent in
News & Media
80%
Formal & Business
10%
Science
5%
Less common in
Encyclopedias
2%
Wiki
2%
Social Media
1%
Ludwig's WRAP-UP
The word "on" is a multifaceted term in the English language, functioning as a preposition, adverb, verb, and adjective. Its prevalence is evident in various contexts, particularly in news and media sources. As Ludwig AI points out, "on" effectively indicates location, time, state, or condition, rendering it an indispensable tool in both formal and informal communication. When writing, it's crucial to differentiate between "on" and "onto", and the choice of alternative prepositions such as "upon" or "at" depends heavily on the specific context. Mastering the usage of "on" enhances clarity and precision in writing, making it an invaluable asset for effective communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
upon
A more formal alternative, often used in writing.
at
Specifies a location or time.
in operation
Describes the state of being active or functioning.
functioning
Emphasizes the working condition of something.
about
Indicates the subject matter or topic.
concerning
A more formal way to indicate the subject matter.
regarding
Similar to concerning, but may imply a more specific focus.
supported by
Indicates physical or conceptual support.
paid by
Indicates who is responsible for payment.
carried by
Indicates possession or transport.
FAQs
How can I use "on" as an adverb?
As an adverb, "on" typically indicates continuation or direction. For example, "Carry "carry on"" means to continue doing something, and "The light is "the light is on"" means the light is in an operating state.
What prepositions can I use instead of "on"?
Depending on the context, you can use prepositions like "upon", "at", "about", or "concerning" instead of "on". The best choice depends on the specific meaning you want to convey.
Is it correct to say "based in" or "based on"?
Both phrases are correct, but they have different meanings. "Based in" refers to a location, while "based "based on"" refers to a foundation or source of information.
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
93%
Authority and reliability
4.6/5
Expert rating
Real-world application tested