know的过去式

v be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about

v know how to do or perform something

v be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt

v be familiar or acquainted with a person or an object

v have firsthand knowledge of states, situations, emotions, or sensations

v accept (someone) to be what is claimed or accept his power and authority

v have fixed in the mind

v have sexual intercourse with

v know the nature or character of

v be able to distinguish, recognize as being different

v perceive as familiar