Used and loved by millions
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
CEO of Professional Science Editing for Scientists @ prosciediting.com
that i know
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that I know" is correct and usable in written English.
It can be used to indicate knowledge or awareness of a particular fact or situation. Example: "I believe the meeting is scheduled for tomorrow, but that I know is subject to change."
✓ Grammatically correct
News & Media
Science
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
58 human-written examples
That, I know".
News & Media
That, I know, is an optimistic scenario.
News & Media
No America that I know, anyway".
News & Media
I came too late for that, I know.
News & Media
"This is the America that I know".
News & Media
"That I know.
News & Media
Not that I know where".
News & Media
"They know that I know.
News & Media
That I know now.
News & Media
Not that I know of," he said.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
But more than that I know nothing.
News & Media
Expert writing Tips
Best practice
Use "that i know" to express your current understanding or awareness of a situation, acknowledging that your knowledge may be incomplete or subject to change.
Common error
Avoid using "that i know" when you are absolutely certain about something. In such cases, a more direct statement is appropriate.
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that i know" functions as a qualifier, limiting the scope of a statement to the speaker's current understanding or awareness. As Ludwig AI states, it's grammatically correct. It often follows a statement to indicate a potential lack of complete information.
Frequent in
News & Media
50%
Science
25%
Formal & Business
10%
Less common in
Encyclopedias
5%
Wiki
5%
Social Media
5%
Ludwig's WRAP-UP
In summary, the phrase "that i know" is a grammatically sound and relatively common way to express the limitations of one's knowledge. As Ludwig AI confirms, the phrase is correct and usable. It's appropriate in a range of contexts, particularly news and media, and serves to qualify statements where complete certainty is lacking. When using this phrase, be mindful of potential alternatives like "as far as I'm aware" or "to the best of my knowledge" depending on the nuance you wish to convey.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
as far as i'm aware
Replaces "know" with "aware", emphasizing a lack of contradictory information rather than direct knowledge.
to the best of my knowledge
Adds a qualification regarding the completeness or certainty of the speaker's knowledge.
from my understanding
Shifts the focus to personal interpretation and comprehension.
what i understand is
Highlights the speaker's subjective grasp of a situation.
in my experience
Grounds the statement in the speaker's personal observations and encounters.
based on what i've seen
Emphasizes empirical evidence as the foundation for the speaker's assertion.
if i'm not mistaken
Introduces a degree of uncertainty or potential error in the speaker's statement.
as i see it
Indicates a personal perspective or interpretation.
from my perspective
Similar to "as i see it", highlighting a subjective viewpoint.
in my opinion
Explicitly states that the assertion is a matter of personal judgment or belief.
FAQs
How can I use "that i know" in a sentence?
Use "that i know" to indicate the limits of your knowledge about something. For example, "The meeting is scheduled for Tuesday, but "that i know" is subject to change."
What are some alternatives to "that i know"?
You can use alternatives like "as far as I know", "to the best of my knowledge", or "from my understanding" depending on the context.
When is it appropriate to use "that i know" versus "I know"?
"That I know" implies a degree of uncertainty or incompleteness in your knowledge, while "I know" suggests complete certainty. Use ""that i know"" when you want to acknowledge potential limitations in your understanding.
Is "that I know of" different from "that I know"?
Yes, "that I know of" is typically used when referring to the existence of something, while "that I know" is more general and can refer to any fact or situation. For example, "Are there any other restaurants in town? Not that I know of."
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested