1. Input your text below.
2. Get it corrected in a few minutes by our editors.
3. Improve your English!

One of our experts will correct your English.

Our experts

1. Input your text below.
2. Get it corrected in a few minutes by our editors.
3. Improve your English!

One of our experts will correct your English.

Our experts

"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

it's common knowledge

This phrase is correct and commonly used in English.

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.

it's a common knowledge

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

Related Comparisons

Why choose TextRanch?

Lowest prices
Up to 50% lower than other online editing sites.

Fastest Times
Our team of editors is working for you 24/7.

Qualified Editors
Native English experts for UK or US English.

Top Customer Service
We are here to help. Satisfaction guaranteed!