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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak quote

Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

MitStanfordHarvardAustralian Nationa UniversityNanyangOxford

I'm completely sure

Grammar usage guide and real-world examples

Table of contents

Usage summary

Human-verified examples

Expert writing tips

Linguistic context

Ludwig's wrap-up

Alternative expressions

FAQs

Human-verified examples from authoritative sources

Exact Expressions

6 human-written examples

"I'm completely sure".

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News & Media

The New Yorker

"I'm completely sure most people support it," he said.

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News & Media

The New York Times

I want you to take what I'm completely sure is something terrible and transform it.

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News & Media

The New Yorker

"I'm completely sure I'm doing wonderful things," he said, a nervous smile playing around the corners of his mouth.

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News & Media

The New York Times

Ezpeleta said: "I'm completely sure he can challenge, with all the talent he has and all the experience he has.

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News & Media

BBC

"The last time we brought in an external CEO, he had more of a business development background and I'm completely sure what we need now is a product CEO".

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News & Media

TechCrunch

Human-verified similar examples from authoritative sources

Similar Expressions

54 human-written examples

I was completely sure they would be sexually harassed.

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News & Media

The New Yorker

But when that happened, I was completely sure that I'm on the right track.

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News & Media

The New Yorker

As for the inspectors, they should stay, even though I am completely sure Iraq doesn't have anything.

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News & Media

The Guardian

But I truly did play his wife; all at once I am completely sure of this, for I have recalled an odd detail.

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News & Media

The New Yorker

"At that point, I was completely sure that later that day, or the next day, I would try again and I would succeed," St. Aubyn said.

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News & Media

The New Yorker
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Expert writing Tips

Best practice

Place the adverb 'completely' before the adjective 'sure' to maximize the intensifying effect.

Common error

Avoid following "I'm completely sure" with words like 'maybe', 'perhaps' or 'might' (e.g. "I'm completely sure that maybe he left"). This creates a logical clash between your claimed absolute certainty and the uncertainty of the subsequent clause.

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

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

90%

Authority and reliability

4.8/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "I'm completely sure" functions as a declarative clause used to express a high level of subjective certainty. It utilizes a first-person singular pronoun combined with an intensifying adverb and a predicative adjective. In many instances recorded by Ludwig, it acts as a direct response to a question or as a lead-in to a subordinate 'that' clause.

Expression frequency: Uncommon

Frequent in

News & Media

65%

Formal & Business

20%

Wiki

10%

Less common in

Science

3%

Encyclopedias

1%

Social Media

1%

Ludwig's WRAP-UP

In summary, "I'm completely sure" is a robust and grammatically correct way to express total certainty. Ludwig AI analysis shows it is a staple in high-quality journalism, particularly when capturing direct quotes or expressing strong editorial opinions. While it is highly effective for showing conviction, writers should be mindful of the context; in highly formal scientific writing, objective phrases like "it is evident that" might be preferred over this more personal assertion. Overall, it remains a clear and unambiguous tool for any writer's toolkit.

FAQs

How do I use "I'm completely sure" in a sentence?

You can use it to introduce a fact you are certain of, such as, "I'm completely sure that we made the right decision".

What is the difference between "I'm completely sure" and "I'm fairly sure"?

While both express certainty, "I'm completely sure" leaves no room for doubt, whereas "I'm fairly sure" suggests a high probability but admits a small chance of error.

Is it better to say "I am completely sure" or "I'm completely sure"?

The uncontracted form "I am completely sure" is more formal and provides additional emphasis on the word 'am', while the contraction is standard for conversation and general writing.

What can I say instead of "I'm completely sure" in a professional email?

In a professional context, you might prefer "I am absolutely certain", "I am confident" or "I am positive" depending on the desired tone.

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Table of contents

Usage summary

Human-verified examples

Expert writing tips

Linguistic context

Ludwig's wrap-up

Alternative expressions

FAQs

Source & Trust

90%

Authority and reliability

4.8/5

Expert rating

Real-world application tested

Most frequent sentences:

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