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
a common
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a common" is correct and usable in written English.
You might use it when referring to something that is shared or occurring among a group of people or things. For example, "People in the region all share a common language."
✓ Grammatically correct
News & Media
Wiki
Science
Alternative expressions(20)
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
60 human-written examples
"It's a common condition".
News & Media
There's a common purpose".
News & Media
A common ground.
News & Media
A common error.
News & Media
That's a common reaction.
News & Media
It's a common garden.
News & Media
It's a common pattern.
News & Media
A common slip.
News & Media
"That's a common topic.
News & Media
Cultivate a common touch.
News & Media
It's a common denominator".
News & Media
Expert writing Tips
Best practice
When using "a common", ensure the noun it modifies is singular and countable. For example, "a common mistake" is correct, whereas "a common mistakes" is not.
Common error
Avoid using "a common" with uncountable nouns. Instead of "a common knowledge", opt for "common knowledge" or "widespread knowledge".
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a common" functions primarily as a determiner followed by an adjective, modifying a noun to indicate that the noun is typical, frequent, or shared. Ludwig AI confirms this usage is correct in English.
Frequent in
News & Media
65%
Wiki
20%
Science
15%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "a common" is a versatile phrase used to describe something as typical, frequent, or shared. As Ludwig AI confirms, the phrase is grammatically correct and widely used. It functions as a determiner-adjective combination, adding emphasis to the noun it modifies. The phrase is prevalent in News & Media sources, but also appears in Wiki and Science contexts. While "a common" can be used in various scenarios, it's important to use it correctly with countable nouns and avoid misusing it with uncountable nouns. Alternatives like "a typical" or "a frequent" can be used depending on the specific context.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a usual
Substitutes "common" with "usual", implying something that regularly occurs.
a typical
Replaces "common" with "typical", suggesting something representative of a type or group.
a frequent
Uses "frequent" instead of "common", emphasizing the high occurrence rate.
a prevalent
Employs "prevalent" in place of "common", indicating widespread existence or acceptance.
a widespread
Replaces "common" with "widespread", highlighting the extensive distribution or reach.
a general
Uses "general" to convey the sense of being applicable to many or most cases, rather than specific ones.
a shared
Emphasizes that something is possessed or experienced jointly.
a mutual
Highlights reciprocity or shared feelings/actions between two or more parties.
a joint
Suggests something done or held by two or more people together.
a collective
Indicates something done or held by a group of people.
FAQs
How can I use "a common" in a sentence?
You can use "a common" to describe something that is frequently encountered or shared. For example, "It's "a common misconception" that all spiders spin webs" or "They share "a common goal" of improving the community".
What are some alternatives to saying "a common"?
Depending on the context, you could use alternatives like "a typical", "a frequent", or "a widespread".
Is it correct to say "a common problem" or "common problem"?
Both phrases can be correct, but they have slightly different meanings. "A common problem" refers to one specific problem that occurs frequently, while "common problem" refers to the general category of problems that are frequently encountered.
What's the difference between "a common" and "the common"?
"A common" implies something is typical or widespread among many things. "The common", used as a noun, usually refers to a shared public space or resource, like "the village common".
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested