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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
I do know that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "I do know that" is correct and usable in written English.
You can use it to emphasize your awareness or certainty about a particular fact or situation. Example: "I do know that the meeting is scheduled for tomorrow, despite what others may think."
✓ Grammatically correct
News & Media
Formal & Business
Science
Alternative expressions(20)
i am familiar with that
i am aware that
I do appreciate that
I do wish that
I do accept that
i know that
I do recognize that
I do find that
I can confirm that
I am aware of the fact that
i am conscious that
I am well aware that
I know that
I do remember that
I have known that
i became aware that
I am conscious that
i understand that
I am sure that
I do admire that
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
54 human-written examples
I do know that.
News & Media
But as a pedant, I do know that Google exists.
News & Media
But everybody can't sing – I do know that!
News & Media
And yes, I do know that is a cliché.
News & Media
I do know that fighting is a very minimal part of the sport nowadays.
News & Media
Connick: I do know that!
News & Media
"I do know that there's injustice".
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
4 human-written examples
RF: I do know that fashion is not about conformity.
News & Media
I do know that without me, Twitter wouldn't exist".
News & Media
DeVOS: I do know that.
News & Media
SANDERS: I do know that it was mentioned.
News & Media
Expert writing Tips
Best practice
Use "I do know that" to add emphasis to a statement when you want to highlight your certainty or knowledge, especially when there might be doubt or disagreement. For example: "While others might be unsure, "I do know that" the report is accurate."
Common error
Avoid using "I do know that" too frequently, as it can make your writing sound repetitive or defensive. Opt for simpler alternatives like "I know that" or "I am aware that" in most cases to maintain clarity and conciseness.
Source & Trust
88%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "I do know that" functions as a declarative statement with added emphasis. The auxiliary verb "do" reinforces the speaker's certainty or awareness of a particular fact or situation. Ludwig AI confirms this through the provided examples.
Frequent in
News & Media
66%
Formal & Business
16%
Science
16%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
"I do know that" is a phrase used to emphatically assert one's knowledge or certainty about a particular fact. It functions grammatically as a declarative statement with added emphasis, as confirmed by Ludwig. While grammatically correct and usable, Ludwig examples show that overusing it can make writing sound repetitive, so it's best reserved for situations where you want to strongly emphasize your awareness. The phrase appears most frequently in news and media contexts and has a neutral register. Alternatives include "I am certain that" or "I am aware that", which offer similar meanings with slight variations in emphasis.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
I positively know that
Adds extra emphasis to the knowledge being expressed.
I am sure that
Expresses a strong belief or conviction about something.
I am aware that
Focuses on the knowledge or consciousness of a fact.
I have no doubt that
Highlights a lack of uncertainty about a particular matter.
I am certain that
Emphasizes a higher degree of confidence and conviction.
I'm well aware that
Emphasizes that the speaker possesses a full and comprehensive awareness.
I can confirm that
Used to officially verify or validate a statement.
It is my understanding that
Indicates knowledge based on information received or inferred.
I fully realize that
Indicates a complete understanding and acknowledgment of a situation.
Beyond question, I know that
Emphasizes the irrefutable nature of the speaker's knowledge.
FAQs
How can I use "I do know that" in a sentence?
"I do know that" is used to emphasize your knowledge of something. For example, ""I do know that" the deadline is tomorrow, so we need to finish the report today."
What can I say instead of "I do know that"?
You can use alternatives like "I am aware that", "I am certain that", or "I am sure that" depending on the context. These phrases convey a similar meaning with slightly different nuances.
Is it grammatically correct to say "I do know that"?
Yes, it is grammatically correct. The "do" is used for emphasis. Without the "do", the sentence "I know that" is also correct, but lacks the added emphasis.
What's the difference between "I know that" and "I do know that"?
The addition of "do" in ""I do know that"" emphasizes the speaker's certainty or awareness. "I know that" simply states a fact, while ""I do know that"" underscores the speaker's conviction.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.1/5
Expert rating
Real-world application tested