know
v.v. to have information about something in your mind. You also use it when you are familiar with a person or a place.
v. to possess information or understanding through experience or study; to be acquainted with a person, place, or thing. Often functions as a stative verb and is rarely used in the continuous form.
I know the answer to your question.
She has lived in this city for ten years, so she knows the best places to eat.
While many claim to know the truth about the incident, the evidence suggests that the actual sequence of events remains a mystery to everyone involved.
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, “I know”) and γνῶσις (gnôsis, “knowledge”), Albanian njoh (“I 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).
Shortening of you know (sense 4)—Singapore English favours pro-drop constructions (Wee, 2003).
Stative verb — typically not used in the progressive (-ing) form. Takes a direct object or a 'that' clause.
I am knowing him for yearsI have known him for yearsAs a stative verb, 'know' is not used in continuous tenses; use the present perfect to describe a state starting in the past.