I certainly know

USAGE SUMMARY

The phrase "I certainly know" is correct and usable in written English.
You can use it to express confidence or assurance about a particular piece of information or fact. Example: "I certainly know that the meeting is scheduled for 10 AM tomorrow."

✓ Grammatically correct

News & Media

Science

Human-verified examples from authoritative sources

Exact Expressions

58 human-written examples

Yes, I certainly know that.

The New York Times - Sports

I certainly know (slightly) more.

The Guardian - Arts

I didn't but I certainly know that from life.

The Guardian

"But I certainly know a lot of very talented people".

The New York Times

I certainly know what my answer would be!

The New Yorker

"I didn't go," Judith said, "though I certainly know the story".

The New Yorker

"I certainly know that the results I'm getting, they're not going to be stripped".

The New York Times - Sports

I certainly know the people you mentioned — but, look, you need a thick skin to be in this business.

The New York Times - Magazine

"I certainly know people who have illnesses and can't get insurance or are stuck at a job," he said.

The New York Times

"I certainly know about the greasy pole of newspapers," he says.

The Guardian

I certainly know we need to do better than the last couple of times he pitched".

The New York Times - Sports

Expert writing Tips

Best practice

When using "I certainly know", follow it with a clear and specific statement of what you know. This provides context and avoids ambiguity.

Common error

Avoid overuse of "I certainly know" in a single piece of writing, as it can come across as repetitive or boastful. Instead, vary your language to express confidence in different ways.

Linguistic Context

The phrase "I certainly know" functions as a declarative statement expressing a strong affirmation of knowledge. As Ludwig AI indicates, it conveys confidence and assurance about a specific piece of information.

Expression frequency: Very common

Frequent in

News & Media

79%

Science

11%

Formal & Business

10%

Less common in

Encyclopedias

0%

Wiki

0%

Reference

0%

Ludwig's WRAP-UP

In summary, "I certainly know" is a grammatically sound and frequently used phrase to express confidence in one's knowledge. Ludwig AI confirms its correctness and usability. Predominantly found in News & Media, it serves to assure the audience of the speaker's certainty. While versatile, avoiding overuse is advised to maintain clarity and avoid sounding boastful. Alternatives such as "I definitely know" or "I am well aware" can provide variety while conveying the same assurance.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I definitely know

Replaces "certainly" with "definitely" to emphasize the sureness of the knowledge.

I surely know

Substitutes "certainly" with "surely", indicating a strong degree of confidence.

I positively know

Uses "positively" instead of "certainly" to reinforce the affirmative nature of knowing.

I absolutely know

Employs "absolutely" to express complete certainty and conviction.

I am well aware

Shifts the structure to "I am aware" adding "well" for emphasis, indicating a good understanding.

I am fully cognizant

Replaces "know" with the more formal "cognizant", indicating complete awareness.

I have no doubt that I know

Introduces a phrase expressing lack of doubt to emphasize the knowing.

It is certain that I know

Changes the sentence structure to highlight the certainty of the knowledge.

I am sure I know

Simplified form using "sure" instead of "certainly", maintaining the core meaning.

I can confirm that I know

Uses "confirm" to indicate that the knowledge is verified or validated.

FAQs

How can I use "I certainly know" in a sentence?

Use "I certainly know" to express confidence about something. For example, "I certainly know that the meeting is scheduled for tomorrow".

What can I say instead of "I certainly know"?

You can use alternatives like "I definitely know", "I surely know", or "I am well aware" depending on the specific context.

Is it better to say "I certainly know" or "I definitely know"?

Both "I certainly know" and "I definitely know" are correct and convey a similar meaning. The choice depends on personal preference and the nuance you want to express.

When is it appropriate to use "I certainly know" in writing?

It's appropriate to use "I certainly know" when you want to express strong confidence about a particular fact or piece of information. However, avoid overusing it, as it can make your writing sound repetitive. Consider using alternatives for variety.