How do you use the word "know" in a sentence?

Here are real-life examples of using "know": I just don't know what to say. I don't know if I have the time.

Know Meaning

/nəʊ/

Definition, CEFR level A1, pronunciation, examples, and quiz.

Definition

verbTo perceive the truth or factuality of; to be certain of; to be certain that.

verbTo be or become aware or cognizant.

Sentence Examples

I just don't know what to say.

I don't know if I have the time.

I don't know if the painting is authentic.

Synonyms & Antonyms

Synonyms:

None

Antonyms:

ignore

CEFR Practice Quiz

To solve this difficult puzzle, you must first ____ the secret code.

CEFR Practice Quiz (Alternate)

I do not ____ the answer to your question, but I can certainly help you to find it out very soon.

Word Origin & History

From Middle English knowen, from Old English cnāwan (“to know, perceive, recognise”), from Proto-West Germanic *knāan, from Proto-Germanic *knēaną (“to know”), from Proto-Indo-European *ǵneh₃- (“to know”). Cognates from Indo-European: Latin gnoscō, Latin cognoscō (Spanish conocer, French connaître, Romanian cunoaște, Italian conoscere, Portuguese conhecer), Ancient Greek γνωρίζω (gnōrízō, “to know”) and γνῶσις (gnôsis, “knowledge”), Albanian njoh (“to know, recognise”), Russian знать (znatʹ, “to know”), Lithuanian žinoti (“to know”), and Persian شناختن (šenâxtan, “to know”). from Proto-Germanic: Scots knaw (“to know, recognise”), Icelandic knega (“to know, know how to, be able”), Old High German knājan (“to know, recognise”), Old Norse kná (“to know how”). Remotely related also Dutch and German kennen, West Frisian kenne (see English ken).

Literary Quotations & Historical Citations

"Question things. I have the most fun when I'm writing questioning things that people do not question- the assumptions that everybody knows are true." — 1985 April 17, Frank Herbert, 15:46 from the start, in Frank Herbert speaking at UCLA 4/17/1985, UCLACommStudies, archived from the original on 10 Feb 2017:

"'[…] I know whether a boy is telling me the truth or not.' 'Thank you, sir.' Did he hell. They never bloody did." — 1991 September, Stephen Fry, chapter 1, in The Liar, London: Heinemann, →ISBN, section II, page 24:

"‘A Gentleman!’ quoth the Squire, ‘who the Devil can he be? Do, Doctor, go down and ſee who ’tis. Mr. Blifil can hardly be come to town yet.—Go down, do, and know what his Buſineſs is.[’]" — 1749, Henry Fielding, “A whimsical Adventure which befel the Squire, with the distressed Situation of Sophia”, in The History of Tom Jones, a Foundling, volume VI, London: A[ndrew] Millar, […], →OCLC, book XVI, page 7:

"I stumbled along through the young pines and huckleberry bushes. Pretty soon I struck into a sort of path that, I cal'lated, might lead to the road I was hunting for. It twisted and turned, and, the first thing I knew, made a sudden bend around a bunch of bayberry scrub and opened out into a big clear space like a lawn." — 1913, Joseph C[rosby] Lincoln, chapter I, in Mr. Pratt’s Patients, New York, N.Y.; London: D[aniel] Appleton and Company, →OCLC, page 18:

"Discovered in 2015, the planet known as K2-18b is twice the size of Earth with eight times the mass. While it is thought to be rocky, no one knows if water’s flowing on the surface." — 2019 September 12, “Scientists discover water, temperature conditions right for life at planet called K2-18b outside solar system”, in South China Morning Post, sourced from Associated Press, →ISSN, →OCLC, archived from the original on 11 Sep 2019, Europe:

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