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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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I certain that

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "I certain that" is not correct in English.
Did you mean "I am certain that"? You can use the corrected phrase when expressing confidence or assurance about something. Example: "I am certain that we will meet the project deadline."

⚠ May contain grammatical issues

Human-verified examples from authoritative sources

Exact Expressions

7 human-written examples

Am I certain that this second round will lead Egypt to true democracy?

News & Media

The New York Times

Nor – which is perhaps more to the point – am I certain that leaving would necessarily be such a bad thing.

News & Media

Independent

I'm not certain that Banged Up will have the policy impact that all of us involved with the programme might have hoped for, nor am I certain that penal abolition is just around the corner.

Am I certain that the current spate of approvals aren't just the result of things going remarkably well for a while?

News & Media

Forbes

"Am I certain that it's there?

News & Media

Huffington Post

Am I certain that the Obama administration won't play favorites with this money?

News & Media

Huffington Post
Show more...

Human-verified similar examples from authoritative sources

Similar Expressions

53 human-written examples

2) Is it certain that A and D are apo?

Science

eLife

Is it certain that all of its effect is due to increased levels of sei?

Science

eLife

Is it certain that this anti-P Ab only recognizes the fully tetra-phosphorylated C-terminus?

Science

eLife

I feel certain that will help.

'I'm certain that's true.

News & Media

The Guardian
Show more...

Expert writing Tips

Best practice

Always use the correct grammatical form "I am certain that" when you want to express assurance or confidence in a statement. Ensure the inclusion of the auxiliary verb "am" for proper sentence construction.

Common error

A common mistake is to omit the auxiliary verb "am" and write "I certain that". This is grammatically incorrect. Always include "am" to form a complete and correct sentence: "I am certain that."

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

1/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "I certain that" is grammatically incomplete. It requires the auxiliary verb "am" to function as a complete sentence. As Ludwig AI points out, this phrase is incorrect and needs correction to convey the intended meaning of certainty.

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 "I certain that" is grammatically incorrect due to the absence of the auxiliary verb "am". The correct form, "I am certain that", should be used to express certainty, assurance, or a strong belief. As Ludwig AI indicates, this correction is essential for proper sentence construction and effective communication. While there are no examples of the incorrect phrase in the provided data, numerous alternatives, such as "I am sure that" and "I believe that", can be used to convey similar meanings.

FAQs

What is the correct way to say "I certain that"?

The correct way to express certainty is to say "I am certain that". The auxiliary verb "am" is necessary for proper grammar.

What can I say instead of "I certain that"?

You can use alternatives like "I am sure that", "I believe that", or "I am convinced that" depending on the context and the level of certainty you want to convey.

Which is correct, "I certain that" or "I am certain that"?

"I am certain that" is the correct form. "I certain that" is grammatically incorrect due to the missing auxiliary verb "am".

What's the difference between "I certain that" and "I am certain that"?

"I certain that" is grammatically incorrect. "I am certain that" is the grammatically correct way to express a feeling of certainty. The inclusion of the verb "am" is essential for proper sentence structure.

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Source & Trust

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Authority and reliability

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Most frequent sentences: