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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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an substantial

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "an substantial" is not correct in written English.
It should be "a substantial" because "substantial" begins with a consonant sound. Example: "The project requires a substantial amount of funding to be successful."

⚠ May contain grammatical issues

Human-verified examples from authoritative sources

Exact Expressions

12 human-written examples

Heaney leaves an substantial and important body of work; his poems always had the human touch.

Due to the current lack of a premium – not dissimilar to the Fair trade model – RTRS has yet to make an substantial impact on soy farmers in Brazil.

News & Media

The Guardian

If you use these programs in an substantial way, then I request that you make note of this in any publications that results.

Speaking before a meeting with the prime minister on Thursday afternoon, Victorian premier Denis Napthine said: "I believe the federal government will not only consider a substantial assistance package, but it is imperative that they provide an substantial assistance package".

Figure 16 shows that hydraulic units of 1 and 2 in well A, 1 and 2 in well B, and 1 and 2 and 3 in well C have an substantial role on fluid transmissibility.

According to a report issued by the Investment Company Institute and Deloitte, employers are thrusting more of the plan charges onto their employees, with the result that workers are now responsible for 91% of plan expenses, an substantial increase from 2009 when they covered 78% of such charges.

News & Media

Forbes
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Human-verified similar examples from authoritative sources

Similar Expressions

48 human-written examples

"A billion is a substantial number.

News & Media

Forbes

We made a substantial bid.

News & Media

The Guardian

A substantial and satisfying volume.

News & Media

Independent

This is a substantial upgrade".

News & Media

The New York Times

A substantial irony enters here.

News & Media

The New York Times
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Expert writing Tips

Best practice

Always ensure the article 'a' or 'an' agrees with the following word's sound. Use 'a' before consonant sounds and 'an' before vowel sounds.

Common error

Avoid using "an" before words that begin with a consonant sound, even if the letter is a vowel. For instance, use "a university" not "an university" because 'university' starts with a 'y' sound.

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 substantial" attempts to function as a determiner plus adjective modifying a noun. However, Ludwig AI indicates it is grammatically incorrect because the article "an" is misused. It should be "a substantial" instead.

Expression frequency: Missing

Frequent in

Science

0%

News & Media

0%

Formal & Business

0%

Less common in

Science

0%

News & Media

0%

Formal & Business

0%

Ludwig's WRAP-UP

In summary, the phrase "an substantial" is grammatically incorrect. As Ludwig AI points out, the correct usage is "a substantial" because "substantial" begins with a consonant sound. This error can affect the clarity and credibility of your writing. Remember to always match the article (a/an) to the sound of the following word. While there aren't examples of "an substantial" in Ludwig's data, understanding this basic grammar rule will help you avoid similar mistakes. Using alternatives such as "a significant" or "a considerable" can also improve your writing.

FAQs

What's the correct way to say "substantial" with an article?

The correct way is to use "a substantial" because the word "substantial" begins with a consonant sound.

Why is "an substantial" grammatically incorrect?

The article "an" is used before words that start with a vowel sound. Since "substantial" starts with the consonant sound /s/, the correct article is "a substantial".

What alternatives can I use that correctly use the article "an"?

While not a direct synonym, you could rephrase your sentence to use words like "an important" or "an essential" component, if the context allows.

How can I avoid making mistakes with articles like "a" and "an"?

Focus on the sound at the beginning of the word, not just the letter. If the word starts with a vowel sound (like 'hour'), use "an". If it starts with a consonant sound (like 'house'), use "a house".

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Source & Trust

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Authority and reliability

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Expert rating

Real-world application tested

Most frequent sentences: