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
are common
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "are common" is correct and usable in written English.
It can be used to describe something that is frequently encountered or widely known. Example: "These types of errors are common in beginner programming courses."
✓ Grammatically correct
News & Media
Encyclopedias
Wiki
Science
Alternative expressions(20)
are apparent
persist unaltered
are significant
remaining the same
remain solid
be preserved
staying the same
be preserved as it is
sustained the same
remains the same
is still the same
remained unchanged
persist unchanged
remain consistent
held steady
was preserved
remain unchanging
was maintained
stayed the same
reiterated the same
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
Wound infections are common.
News & Media
Arbitrage scams are common.
News & Media
Family links are common.
News & Media
Accidents are common.
News & Media
Droughts are common.
Encyclopedias
Dissected plains are common.
Encyclopedias
Group practices are common.
Encyclopedias
Elsewhere, monkeys are common.
Encyclopedias
Nasalized vowels are common.
Encyclopedias
Co-ops are common.
News & Media
What are common themes?
News & Media
Expert writing Tips
Best practice
Use "are common" to describe trends, phenomena, or events that occur frequently or are widely observed. This phrase is versatile and suitable for various contexts, from scientific observations to everyday occurrences.
Common error
Avoid overusing "are common" in descriptive writing, as it can make your writing sound repetitive and bland. Instead, vary your language by using synonyms such as "prevalent", "frequent", or "widespread" to add depth and nuance to your descriptions.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "are common" functions as a predicate adjective, describing the subject by indicating that it occurs frequently or is widely found. Ludwig examples confirm its use in stating the prevalence of various phenomena, conditions, or events.
Frequent in
News & Media
45%
Encyclopedias
15%
Wiki
15%
Less common in
Science
15%
Formal & Business
2%
Reference
3%
Ludwig's WRAP-UP
The phrase "are common" is a versatile and frequently used expression for indicating that something occurs often or is widely prevalent. As Ludwig AI confirms, it is grammatically correct and suitable for various contexts. While highly functional, overuse can lead to bland writing, so consider using synonyms like "prevalent" or "frequent" to add nuance. Its widespread usage across news, encyclopedias, and general reference materials suggests a neutral register suitable for diverse audiences. Remember, “are common” is for plural nouns; use “is common” for singular nouns.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
are frequent
Simply states that something happens often.
are prevalent
Highlights the widespread existence or acceptance of something.
are widespread
Focuses on the extensive distribution of something.
occur frequently
Emphasizes the repeated happening of something.
often happen
Rephrases the common occurrence using a verb-focused structure.
are commonplace
Suggests that something is ordinary and unremarkable because it is so common.
frequently arise
Highlights the repeated emergence of something.
are typical
Indicates that something conforms to a usual type or pattern.
are regularly observed
Focuses on the consistent noticing of something.
are routine
Implies that something is a normal part of a procedure or activity.
FAQs
How can I use "are common" in a sentence?
You can use "are common" to describe something that happens frequently or is widely found. For example, "Wound infections "are common" after surgery" or "Droughts "are common" in this region".
What are some alternatives to "are common"?
Alternatives to "are common" include "are frequent", "are prevalent", "are widespread", or "often happen". The best choice depends on the specific context and the nuance you want to convey.
Is it correct to say "is common" instead of "are common"?
No, "is common" is used with singular nouns, while "are common" is used with plural nouns. For example, "A mistake is common" but "Mistakes "are common"".
What's the difference between "are common" and "are typical"?
"Are common" indicates frequency or prevalence, while "are typical" suggests that something conforms to a usual type or pattern. For instance, "Rainy days "are common" in spring" means it rains often, while "Cloudy days "are typical" in that season" means most days are cloudy.
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