it's common knowledge vs it's a common knowledge

The correct phrase is 'it's common knowledge.' The phrase 'common knowledge' is an uncountable noun and does not require an article before it.

Last updated: March 22, 2024 • 2114 views

This phrase is correct and commonly used in English.

"it's common knowledge"

This phrase is used to indicate that something is widely known or accepted by many people.

Examples:

It's common knowledge that the Earth revolves around the Sun.
It's common knowledge that smoking is bad for your health.
It's common knowledge that exercise is good for you.
It's common knowledge that water boils at 100 degrees Celsius.
It's common knowledge that Shakespeare wrote many famous plays.

Show examples from the web [+]

So it's common knowledge that she's his daughter?
Now, it's common knowledge that he's a friend of the cause, but nothing ties him.
So it's common knowledge on the street what Gibbons up to?
It's common knowledge the vic was shot in the face.
It's common knowledge about you and Elizabeth Tyson.
It's common knowledge you can get anything in the laundry.
It's common knowledge that a ninja mansion has traps.
It's common knowledge that my half-brother Cem is the favored child of my father the Sultan.
It's common knowledge that Madge and Brian intend to wed.
It's common knowledge among jew and gentile alike.
It's common knowledge, the fakirs of Bangladesh can meditate their circulatory systems to a virtual standstill.
But it's common knowledge that the last name of a masthead is most important.
I know it's common knowledge, but you have terrible taste in women... except for Devon!
It's common knowledge around town that Harrison Parker is fighting for its life.
It's common knowledge Arthur would lay down his life for any of his subjects.
It's common knowledge in my family that...
It's common knowledge in Thunder Bay you were living with Quill.
What...? It's common knowledge, the fakirs of Bangladesh can meditate their circulatory systems to a virtual standstill.

This phrase is incorrect in English. 'Common knowledge' is an uncountable noun and does not require an article.

"it's a common knowledge"

How TextRanch works

Fast and reliable proofreading, editing, and language advice tailored to your needs.

1. Choose Your Service

Quick Text Editing

Emails and short texts
Proofreading & editing
Ready in 5-10 minutes

SUBMIT YOUR TEXT NOW

Document Editing

Documents of any type (*.docx)
Advanced & Premium editing
Ready in as little as 4 hours

UPLOAD YOUR DOCUMENT

Ask an Editor

Personalized answers to your language questions
Expert guidance on grammar, style, and usage
Ready in 24 hours

ASK YOUR QUESTION

Upload your document or paste your text directly into our platform. Your text is reviewed and refined by our expert editors (real people, not machines) who understand the nuances of English. Expect corrections, improvements, and insightful suggestions that enhance the clarity, tone, and professionalism of your writing.

3. Receive Your Polished Text

In just a few minutes (or hours for longer documents), you'll receive your corrected text. Review the changes, make any final adjustments, and confidently share your polished English with the world.
You can count on a personalized, friendly service every time you use TextRanch. We're committed to helping you make a great impression with every word you write.

We proofread and edit these types of texts and documents:

Short texts Business Emails Personal Emails Social media posts Resume and Curriculum Vitae Business documents Sales proposal Research and academic papers Thesis Dissertation Essays Articles Blog posts and much more....

Why choose TextRanch?

Complete Privacy

Your texts are safe and secure with us. We never share your information with third parties.

Affordable Pricing

No subscription fees and rates up to 50% cheaper than other online editing services.

100% Satisfaction

We guarantee that you'll be satisfied with the quality of our service or your money back.

Top Customer Service

Our team is here to help you with any questions you may have. Contact us anytime.

Our Customers Love Us!

We have an average rating of 4.79 stars based on 283125 votes, and

4.9 Excellent - Reviews 2.137

"7 years without any disappointment. Always 100% satisfied. You guys are the best in the world at what you do. Thank you so much :)"

Zubair
from Bangladesh

"I wasn't aware of this service, it's fascinating and more reliable than standard IA tools available on the internet"

Arturo
from Mexico

"In a world of text messages and online communication, this is great to have as a live tool. Thank you."

Selena
from USA

"Wow, it's just so excellent. I never would have believed I could have a sure and excellent English companion. Thanks, TextRanch."

Ifiok
from Nigeria

"This is my first time using TextRanch, and I like how the editors take time to correct my text. To everyone who has never used TextRanch before, I highly recommend trying it."

Wilson
from France

"It is an amazing source of feedback because, as a non-native speaker, I really need to have a reliable helper correct my text."

Susan
from Germany

it's common knowledge vs it's a common knowledge