I'm certain that

USAGE SUMMARY

"I'm certain that" is correct and usable in written English
You can use the phrase when you want to express the fact that you strongly believe something to be true. For example: "I'm certain that this policy will have a positive effect on the company."

✓ Grammatically correct

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

But "I'm certain that he told that story," he added.

The New York Times

I'm certain that my life is in danger".

Independent

I'm certain that genuinely happy people live here.

Independent

I shot first, I'm certain that I killed.

The Guardian

I'm certain that at least one of those things happened.

The Guardian - Sport

"I'm certain that drought is a big problem," said Driver.

The Guardian

"I'm certain that with 11 players we would have won.

The Guardian - Sport

I'm certain that none of us were scared.

The Guardian

"I'm certain that if it goes to the government," he said, "it will be worse".

The New York Times

I'm certain that a palm reader would trace a long laugh line in Lipman's hand.

The New York Times - Books

I'm certain that, if you're a fan of the series, this analysis irritates you.

The New Yorker

Expert writing Tips

Best practice

Use "I'm certain that" to express a strong belief or conviction based on evidence or reasoning. Avoid using it when stating a mere opinion without any supporting rationale.

Common error

While "I'm certain that" is acceptable in many situations, overuse in formal writing can sound repetitive or less professional. Consider using more nuanced synonyms like "I am convinced that" or "It is evident that" to vary your language and strengthen your argument.

Linguistic Context

The primary grammatical function of "I'm certain that" is to act as a declarative phrase introducing a statement of strong belief or conviction. Ludwig AI indicates that this phrase is frequently used to express confidence in the truth or validity of a proposition.

Expression frequency: Very common

Frequent in

News & Media

88%

Formal & Business

6%

Science

3%

Less common in

Academia

1%

Encyclopedias

1%

Wiki

1%

Ludwig's WRAP-UP

In summary, "I'm certain that" is a very common and grammatically sound phrase used to express a strong belief or conviction. Ludwig AI confirms its correct usage in written English. Predominantly found in News & Media sources, this phrase serves to persuade or reassure the audience. While versatile, it's important to avoid overuse, especially in formal writing, where synonyms like "I am convinced that" or "It is evident that" may be more appropriate. Ludwig's examples further illustrate its broad applicability across various contexts, reinforcing its role as a powerful tool for conveying certainty.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I am sure that

Replaces 'certain' with 'sure', a more common synonym, maintaining a similar level of confidence.

I'm quite sure that

Adds a qualifier ('quite') to soften the tone slightly while still expressing confidence.

I am positive that

Emphasizes conviction even more strongly, using 'positive' to replace 'certain'.

I am convinced that

Highlights the process of arriving at the belief, suggesting a reasoned conclusion.

I have no doubt that

Expresses certainty by negating doubt, offering a slightly more emphatic tone.

I feel confident that

Links certainty to a feeling of confidence, suggesting a personal perspective.

I firmly believe that

Highlights the strength of the speaker's conviction.

It is my belief that

Shifts the focus to the belief itself, rather than the speaker's certainty.

I can assure you that

Offers reassurance to the listener, framing the statement as a guarantee.

It is beyond question that

Indicates that something is undeniably true.

FAQs

What does "I'm certain that" mean?

The phrase "I'm certain that" expresses a strong belief or conviction about something. It indicates a high degree of confidence in the truth or validity of a statement.

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

You can use alternatives like "I am sure that", "I am positive that", or "I am convinced that" depending on the context.

Is it appropriate to use "I'm certain that" in formal writing?

Yes, "I'm certain that" is generally acceptable in formal writing, but it's important to use it judiciously. Overuse can make your writing sound repetitive. Consider more formal alternatives like "It is evident that" or "I am convinced that" for variety.

How does "I'm certain that" differ from "I think that"?

"I'm certain that" conveys a much stronger sense of confidence and conviction than "I think that". While "I think that" suggests a tentative opinion, "I'm certain that" indicates a firm belief based on evidence or reasoning.