2、never mind，常用的包括看在什么场合、语境中用。it is not important; do not fret。不重要，别担心。i’m afraid i’ve broken your mug. — never mind, it was old and i was going to throw it away.（不重要）
did you fall over and hurt your knee? never mind, i’ll put a bandage on it. （别担心）
3、do not be concerned (about someone or something, or about doing something)（别管某人、某事）