Know V1 V2 V3 V4 V5, Past Simple and Past Participle Form of Know Verb; Know Meaning; understand, savvy, wise up, be wise to V1, V2, V3, V4, V5 Form of Know Base Form Past Form Past Participle know knew known Base Form s/es/ies ing Form know knows knowing Synonym for Know understand savvy wise up be wise to wise up to recognize get to know identify acknowledge be acquainted with taste experience try die extract distinguish individuate differentiate discriminate happen live through pass ... Know definition: to perceive or understand as fact or truth; to apprehend clearly and with certainty.. See examples of KNOW used in a sentence. Google's service, offered free of charge, instantly translates words, phrases, and web pages between English and over 100 other languages. Learn the meaning, pronunciation, and grammar of the verb know , as well as its synonyms, antonyms, and idioms. Find out how to use know in different contexts and situations, such as expressing certainty, familiarity, or experience.