i certainly know

USAGE SUMMARY

The phrase "I certainly know" is correct and usable in written English.
It can be used 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

Use "I certainly know" to express confidence in your knowledge or understanding of a subject. It's suitable for both formal and informal contexts.

Common error

Avoid using "certainly" too frequently, as it can make your writing sound repetitive. Vary your language with alternatives like "definitely", "absolutely", or "undoubtedly" to maintain reader engagement.

Linguistic Context

The phrase "i certainly know" functions as an expression of strong affirmation or confirmation. It asserts the speaker's firm knowledge or understanding of a particular fact or situation. Ludwig examples show its usage in various contexts to convey certainty.

Expression frequency: Very common

Frequent in

News & Media

69%

Science

19%

Formal & Business

3%

Less common in

Encyclopedias

0%

Wiki

0%

Reference

0%

Ludwig's WRAP-UP

In summary, "i certainly know" is a very common phrase used to express confidence and assurance about a particular piece of information. Ludwig AI confirms it's grammatically correct and versatile, appearing frequently in news, media, and scientific contexts. While appropriate for various settings, varying your language is advisable to avoid repetition. Consider alternatives like "I definitely know" or "I absolutely know" to maintain reader engagement.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

i definitely know

Replaces "certainly" with "definitely", indicating a strong sense of knowing.

i surely know

Substitutes "certainly" with "surely", conveying confidence.

i absolutely know

Uses "absolutely" instead of "certainly", emphasizing a complete and unwavering knowledge.

i positively know

Replaces "certainly" with "positively", implying a confident and affirmative knowledge.

i have no doubt i know

Expresses certainty by stating the absence of doubt.

i am certain i know

Uses "am certain" to replace "certainly know", expressing a firm belief or knowledge.

i am sure i know

Replaces "certainly" with "am sure", conveying confidence based on information or evidence.

i am well aware

Indicates a good understanding or knowledge of something

i fully understand

Emphasizes a complete comprehension.

i know for a fact

Indicates knowledge is based on concrete evidence.

FAQs

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

You can use "i certainly know" to express confidence or assurance about something. For example, "I certainly know that the deadline is next Friday".

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

You can use alternatives like "i definitely know", "i surely know", or "i absolutely know" depending on the context.

Which is correct, "i certainly know" or "i surely know"?

Both "i certainly know" and "i surely know" are correct, but "i certainly know" is more common and versatile.

What's the difference between "i certainly know" and "i think i know"?

"I certainly know" expresses a higher degree of confidence than "I think I know". The latter implies a degree of uncertainty, while the former suggests a firm conviction.