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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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an common

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "an common" is not correct in written English.
The correct article to use before "common" is "a" because "common" begins with a consonant sound. Example: "It is a common misconception that all swans are white."

⚠ May contain grammatical issues

Human-verified examples from authoritative sources

Exact Expressions

8 human-written examples

We are using a Corona/Core architecture, where each block has an common interface known as the Corona, and one or more implementations, known as the Cores.

In an common moment of eccentricity, Higgins bought the entire 1939 crop of mahogany from the Philippines and stored it on his own.

Dominic Grieve described as an "common sense" a suggestion by the MPs and peers that privacy injunctions should routinely be served on internet companies, as well as newspapers and broadcasters.

News & Media

The Guardian

The results obtained were compared with those achieved by manual and automated batch procedures and flow manifolds with different cells: an common quartz flow cell, a helix cell and the most used spiral cell.

Science

Talanta

The current article is, however, based on observations by experts that people confuse technologies due to an (common) absence of knowledge (Nap et al. 2002; van Dam and de Vriend 2002), rather than not accept them.

Specifically, an common coding variant, rs10516487 (R61H), was shown to confer a strong protective effect against the disease and was then replicated in the same study in separate South American and European cohorts of patients with SLE.

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Human-verified similar examples from authoritative sources

Similar Expressions

52 human-written examples

A common threat demands a common response.

News & Media

The New York Times

A good team has a common goal.

A common ground.

News & Media

The New York Times

A common error.

News & Media

The New York Times

A common refrain.

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Expert writing Tips

Best practice

Always use the article "a" before words that begin with a consonant sound, such as "common". Remember that it's about the sound, not just the letter, so be mindful of silent letters or unusual pronunciations.

Common error

Don't assume that all words starting with consonants require the article "an". It’s the sound that matters. For example, "an hour" is correct because "hour" begins with a vowel sound, despite starting with the consonant "h". Similarly, avoid using "an" before acronyms that start with a consonant sound, such as "a URL".

Antonio Rotolo, PhD - Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

60%

Authority and reliability

1.2/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "an common" is a grammatical error resulting from the incorrect use of the indefinite article. The indefinite article "an" is used before words that begin with a vowel sound, while the article "a" is used before words that begin with a consonant sound. Ludwig AI indicates that this phrase is incorrect.

Expression frequency: Missing

Frequent in

Science

0%

News & Media

0%

Formal & Business

0%

Less common in

Science

0%

News & Media

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Formal & Business

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Ludwig's WRAP-UP

The phrase "an common" is a grammatical error due to the incorrect use of the indefinite article "an" before the word "common", which starts with a consonant sound. As Ludwig AI states, the correct article is "a", making "a common" the accurate phrase. This error is not found in authoritative sources, emphasizing the importance of using "a" before consonant sounds and "an" before vowel sounds. Remember, it’s the sound, not the letter, that dictates the choice of article. Correcting such errors enhances clarity and credibility in writing.

FAQs

Why is "an common" grammatically incorrect?

The phrase "an common" is incorrect because the article "an" is used before words starting with a vowel sound, not just a vowel. Since "common" starts with a consonant sound, the correct article is "a", making /s/a+common a common the right choice.

What's the rule for using "a" versus "an"?

Use "a" before words starting with a consonant sound (e.g., a car, a university—because "university" starts with the consonant sound /ju:/). Use "an" before words starting with a vowel sound (e.g., an apple, an hour—because "hour" starts with the vowel sound /aʊ/). It's about the sound, not the letter itself.

What are some correct examples using the word "common"?

Here are a few examples: "It's "a common practice"", "That's "a common mistake"", or "He has "a common sense"". The article "a" is correctly used before the word "common" because it begins with a consonant sound.

Are there exceptions to the "a" vs "an" rule?

Yes, the primary exception revolves around pronunciation. Words like "hour" or "honest" use "an" because their initial consonant is silent, resulting in a vowel sound at the start. Similarly, acronyms are pronounced based on their initial sound (e.g., "an MBA" vs "a CPA").

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Real-world application tested

Most frequent sentences: