is certain that

USAGE SUMMARY

The phrase "is certain that" is correct and usable in written English.
It can be used to express a strong belief or assurance about something. Example: "She is certain that the project will be completed on time."

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Even if nothing else is certain, that is.

The Washington Post

It is certain that they will.

The Economist

It is certain that nationalist currents exist.

The New York Times

And everyone is certain that will happen.

The New York Times

And he is certain that he will win.

The New York Times

But he is certain that the newspaper remains a target.

The New York Times

Mr. DiCamillo is certain that film sales will follow.

The New York Times

He is certain that the Rapture is imminent.

The Guardian

And yet Dreher is certain that gay marriage is wrong.

The New Yorker

Yet Martin is certain that he was right.

The Guardian

Geach is certain that he saw Wittgenstein leave before that.

The Guardian - Books

Expert writing Tips

Best practice

Combine "is certain that" with hedging language to balance conviction with nuance if the statement is not definitively proven. For example, “While further research is needed, the scientist is certain that preliminary results point to a significant correlation.”

Common error

Avoid using "is certain that" when expressing opinions or predictions that lack solid evidence. Overstating certainty can undermine your credibility if the outcome proves otherwise.

Linguistic Context

The phrase "is certain that" functions as a declarative expression introducing a clause that states a strong belief or conviction. Ludwig AI shows that it connects a subject with their firm belief about a following statement. This construction serves to assert the speaker's confidence in the truth or validity of the subsequent clause.

Expression frequency: Very common

Frequent in

News & Media

48%

Science

28%

Formal & Business

10%

Less common in

Wiki

4%

Academia

4%

Reference

2%

Ludwig's WRAP-UP

In summary, "is certain that" is a versatile phrase used to express strong conviction across diverse contexts. As shown by Ludwig AI, its frequency and applicability in News & Media, Science, and Formal & Business settings highlight its importance in professional and academic communication. While grammatically sound and widely accepted, as confirmed by Ludwig AI, overstating certainty without sufficient evidence should be avoided. By considering alternatives like "is convinced that" or "is confident that" and understanding its communicative purpose, writers can effectively leverage "is certain that" to enhance their writing.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

is convinced that

Emphasizes a strong belief based on persuasive evidence or reasoning.

is sure that

Expresses a feeling of confidence without necessarily implying a strong basis for the belief.

is confident that

Highlights a feeling of self-assurance and trust in one's judgment.

is positive that

Indicates an affirmative and definite stance on a matter.

has no doubt that

Suggests a complete absence of uncertainty or skepticism.

firmly believes that

Emphasizes the strength and conviction of the belief.

is of the opinion that

Presents the statement as a considered judgment or personal perspective.

is under the impression that

Indicates a belief based on a particular understanding or interpretation.

takes it for granted that

Suggests an assumption that is accepted without question.

is led to believe that

Highlights that the belief is based on external information or influence.

FAQs

How can I use "is certain that" in a sentence?

The phrase "is certain that" introduces a clause expressing a strong belief or conviction. For example, "She "is certain that" the project will succeed."

What are some alternatives to "is certain that"?

You can use alternatives like "is convinced that", "is sure that", or "is confident that" depending on the level of conviction you want to convey.

When is it appropriate to use "is certain that"?

Use "is certain that" when you have a high degree of confidence in the truth or validity of a statement. It's best used when you have strong evidence or reasoning to support your belief. Avoid using it when expressing mere opinions or speculations.

What is the difference between "is certain that" and "believes that"?

"Is certain that" expresses a stronger level of conviction than "believes that". While "believes that" indicates a personal opinion or judgment, "is certain that" implies a more definitive and unwavering assurance.