to know the meaning of words or what someone says
I understand the question, but I don't know the answer.
질문은 이해하지만, 답은 모릅니다.
to know how or why something happens
I don't understand how this machine works.
이 기계가 어떻게 작동하는지 이해하지 못합니다.
to know how someone feels or why they act a certain way
My best friend always understands my feelings.
나의 가장 친한 친구는 항상 내 감정을 이해합니다.
to believe something is true based on what you've heard
I understand that the meeting has been canceled.
회의가 취소되었다고 들었습니다.
to agree on something without saying it
We understand that we need to finish by Friday.
우리는 금요일까지 마쳐야 한다는 것을 암묵적으로 이해합니다.
to know that a word is missing but still understand the meaning
In 'She can sing', the word 'well' is understood.
'그녀는 노래할 수 있다'라는 문장에서 '잘'이라는 단어가 암시적으로 이해됩니다.