I do know

USAGE SUMMARY

The phrase "I do know" is grammatically correct and commonly used in both spoken and written English.
It is typically used for emphasis or to emphasize agreement or confirmation. For example: - "I do know that I need to finish my project by tomorrow." - "John, I do know how to drive a manual car." - "Yes, I do know what time the meeting starts." - "I do know that it can be difficult to learn a new language." - "I do know that it's important to exercise regularly."

✓ Grammatically correct

News & Media

Human-verified examples from authoritative sources

Exact Expressions

55 human-written examples

I do know that.

The New York Times - Sports

I do know Bliss.

The New Yorker

That I do know.

The New Yorker

BLANKENHORN: But I do know.

The New Yorker

Oh, yes, I do know.

The New York Times - Arts

I do know the answer..

The New Yorker

Here's what I do know.

The New York Times

I do know the details.

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

3 human-written examples

"But I do know..

Los Angeles Times

I do know this, though.

Huffington Post

I do know this job, man.

The New York Times

Expert writing Tips

Best practice

Use "I do know" to add emphasis or conviction to a statement, especially when responding to doubt or disagreement. For example, "I do know what I'm talking about, I've been working in this field for years."

Common error

Avoid using "I do know" excessively, as it can sound defensive or condescending. Consider using simpler alternatives like "I know" or "I understand" in contexts where strong emphasis is not needed.

Linguistic Context

The primary grammatical function of "I do know" is to provide an emphatic affirmation. The auxiliary verb "do" adds force to the verb "know", highlighting the speaker's certainty or awareness. Ludwig confirms that this structure is grammatically correct and commonly used for emphasis.

Expression frequency: Very common

Frequent in

News & Media

95%

Science

2%

Formal & Business

1%

Less common in

Encyclopedias

0%

Wiki

0%

Reference

0%

Ludwig's WRAP-UP

In summary, the phrase "I do know" is a grammatically correct and widely used expression for adding emphasis to a statement of knowledge. As Ludwig AI confirms, it's most frequently found in news and media contexts and serves to convey conviction or certainty. While effective for emphasis, overuse can lead to a defensive or condescending tone, so consider context and audience. Alternatives such as "I am aware" or "I understand" may be more suitable in formal situations. Overall, "I do know" is a versatile tool for expressing knowledge with emphasis, but it should be used judiciously.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I definitely know

Adds "definitely" to strongly emphasize the verb.

I understand

Substitutes "know" with "understand", focusing on comprehension rather than just knowledge.

I am aware

Replaces "do know" with a more formal synonym "am aware", reducing emphasis.

I am certain

Replaces "know" with "certain", emphasizing confidence and conviction.

I'm cognizant

Uses "cognizant", a more formal and less common synonym for "aware", increasing formality.

I'm sure

An abbreviation of "I am sure", it is less formal with similar emphasis to the original.

I happen to know

Adds "happen to", suggesting the knowledge is incidental or surprising.

It is known to me

Inverts the sentence structure making it more formal and passive.

Rest assured, I know

Adds "rest assured" to reassure the listener, implying potential doubt.

Let me assure you, I know

Similar to "rest assured", but more formal and explicit in offering reassurance.

FAQs

When should I use "I do know" instead of "I know"?

Use "I do know" when you want to emphasize that you possess knowledge of something, especially if your knowledge has been questioned or doubted. It adds a degree of conviction that "I know" might lack.

What are some alternative ways to express "I do know"?

You can use alternatives like "I am aware", "I understand", or "I am certain" depending on the specific context and the level of formality you want to convey.

Is it grammatically correct to say "I do know"?

Yes, "I do know" is grammatically correct. The auxiliary verb "do" is used for emphasis in affirmative sentences.

Can "I do know" sound defensive?

Yes, overusing "I do know" can sometimes sound defensive or even condescending. Be mindful of the context and your tone when using this phrase. Consider the impact it might have on your audience.